Studying Wushi M_W7.0 earthquake on January 23,2024 is the key to understanding the seismogenic structure in this area. The slip distribution of Wushi earthquake is inverted by using InSAR technology and distributed slip model. The results show that the seismogenic fault is Maidan fault, and the seismogenic fault is dominated by thrust type and has a small amount of left-lateral strike-slip component. The strike is 230°, the dip angle is 48°, the maximum slip is 2.23 m, the moment magnitude is M_W6.99, and the motion mode of the earthquake is thrust earthquake. The static Coulomb stress caused by the earthquake shows that the near-field area along the fault strike direction at both ends of the north and south is a dangerous area for future moderate-strong earthquakes.

In order to deeply understand the Leiqiong volcanic area, the relevant research done by the predecessors in the Leiqiong area was collected, and the volcanic geological features and chronology characteristics of the area were summarized. The data show that the Leiqiong area is affected by plate movement and mantle plume activity, and is controlled by three groups of NW, NE and EW fault zones, with strong volcanic activity. The Leiqiong depression basin was formed between the EW Huangpo-Jiepao fault zone in Leizhou Peninsula and the EW Wangwu-Wenjiao fault zone in northern Hainan Island. There are a large number of basic basalt eruptions in the basin. The volcanic activities in Leiqiong area are characterized by multi-stage, multi-cycle and migration. There are three types of volcanism: explosive facies, effusive facies and effusive-sedimentary facies, forming volcanic landform types such as lava platform, volcanic cone, Maar lake, volcanic dome and lava tunnel. The magmatic activity in Leiqiong area began in the late Oligocene, which was the most extensive in the Pleistocene, and then the volcanic activity declined and ended in the Holocene.The previous geochronological data of the Leiqiong volcanic area obtained by K-Ar, Ar-Ar, thermoluminescence and ¹⁴C dating methods show that the age range of the volcanic rocks in the area is between 34.78 and 0.01 Ma, and the volcanic activity is divided into six stages: Oligocene-Miocene, Pliocene, Early Pleistocene, Middle Pleistocene, Late Pleistocene and Holocene.

In order to explore the applicability of RST algorithm in the extraction of seismic thermal infrared anomalies in Xinjiang region, the MODIS land surface temperature data set of Wushi M_S7.1 earthquake was constructed, and after removing the pixel-by-pixel time series trend of the data set, RST algorithm was used to extract the surface temperature anomaly information of Wushi M_S7.1 earthquake. The results show that the change process of surface temperature anomaly in Wushi M_S7.1 earthquake can be divided into six stages: emergence-disappearance-reappearance-expansion-maximum-disappearance; The abnormal area of surface temperature of Wushi M_S7.1 earthquake is distributed along the strike of tectonic zone. Wushi M_S7.1 earthquake occurred 99 days after the maximum surface temperature anomaly. It is feasible to extract seismic thermal infrared anomaly by combining MODIS data with RST algorithm in relevant research of Xinjiang region.

A total of 813 instrument intensity information and 496 sets of strong motion records of Wushi 7.1 earthquake were obtained by Xinjiang Seismic Network Center. The peak acceleration of PH002 station was 280.68 cm·s^-2, which was the maximum peak acceleration obtained this time.This paper compares the attenuation relationship between the peak accelerations obtained from 219 stations and the fifth generation of China Seismic Ground Motion Parameter Zoning Map, and finds that the two are more consistent within a range of 100 km.This paper calculates and analyzes 5 peak accelerations exceeding 100 cm·s^-2. The acceleration response spectrum of these 5 stations was compared and analyzed with the seismic design response spectrum. At the same time, the effective seismic duration of these 5 stations was calculated, and it was found that the seismic energy release was faster within 200 km, indicating a greater seismic destructive force.

Wushi M_S7.1 earthquake is the first earthquake above M7 since the completion of the national earthquake intensity rapid report and early warning project. In order to improve the ability to prevent and mitigate earthquake risk, the construction of earthquake intensity rapid report and early warning project is put in place. The magnitude, epicentral location and focal depth results of the real-time output of early warning are compared with the official rapid report results of the National Network Center, and the instrument intensity output error is analyzed. The results show that the national early warning network can still demonstrate stable, reliable and efficient earthquake early warning and intensity rapid reporting capabilities in the case of severe epicenter deviation.

In order to further study Wushi M_S7.1 earthquake, double-difference seismic position method was used to relocate the seismic sequence, and the positioning results showed that: ① after relocation, the spatial position of the mainshock did not change much. It was 2 km away from the position before relocation, and the depth was 25.6 km, which was deeper than that before relocation. ② After reposition, earthquake sequence had a tendency to develop southward along the Maidan fault, which was basically consistent with the distribution characteristics of disasters.③ When the Maidan fault was extruded by the piedmont extrusion, it was stopped near the epicenter of the mainshock, and the seismic structure of the Wushi section of the Maidan fault was deeper than that of the Aheqi section, and the activity was relatively weak, so there were more and shallow aftershocks in the SW direction and fewer and deeper aftershocks in the NE direction in the mainshock epicenter.

In order to study the temporal and spatial variation of Wushi M_S7.1 earthquake sequence and the characteristics of the source parameters, the results show that the aftershocks are mainly distributed on the northeast and southwest sides of the main shock, and the distribution is basically consistent with the strike of the Maidan fault. The current sequence b value is 0.67, h value is 1.3, and p value is 1.28. The focal mechanism solution is thrust type, the stress drop is at a low level, and the sequence attenuation is basically normal. The earthquake is a mainshock-aftershock type, and the largest aftershock is M_S5.8 earthquake.

After Wushi M_S7.1 earthquake occurred on January 23,2024, the seismic intensity map was drawn according to the post-earthquake damage survey results, combined with the remote sensing image, focal mechanism and seismogenic structure of the earthquake area. In the process of drawing the intensity map, the IX degree is located in the mountainous area and lacks the layout of the strong earthquake network. Therefore, the InSAR results are referred to for the first time when determining the IX degree intensity circle. By comparing the results of earthquake damage investigation and instrument intensity results, it is found that the two are in good agreement, so the instrument results are referred to when determining the boundary of the intensity circle. This study focuses on the destruction of various types of houses in different intensity areas and the phenomenon of earthquake geological disasters, and analyzes and determines the characteristics of various types of house damage.

Twenty blasting events, five collapse events and 25 seismic events recorded by M_L2.4～3.8 Xinjiang Seismic Network from 2017 to 2023 were selected. The waveform recording characteristics, vertical P-wave initial direction, amplitude ratio and time-frequency analysis method were used to study the characteristics of non-natural earthquakes. The analysis results show that there are obvious differences between non-natural earthquakes and natural earthquakes in time domain and frequency domain. The vertical P-wave of blasting events develops upward, the period is small, the amplitude and period of S-wave do not change significantly, and it is easy to be confused with surface waves. The collapse event is vertically downward P wave, P wave S wave appears in groups and is close to each other, and the waveform is simpler than blasting. The vibration attenuation of both is fast, and the surface wave is developed. The value of blasting Pc/Sm is greater than 0.42, the earthquake is less than 0.42, and the value of collapse Pc/Sm is greater than 0.62. The value of Pm/Sm of blasting is greater than 0.70, the earthquake is less than 0.70, concentrated at about 0.40, and the value of Pm/Sm of collapse is about 0.55. In terms of time-frequency analysis, the frequency components of earthquakes and collapses are simple, the energy peak is below 4 Hz, the frequency domain is narrow, mainly low-frequency surface waves, and the attenuation is fast, showing the characteristics of “few peaks”. The seismic frequency components are complex, distributed between 4 Hz and 16 Hz, the frequency domain is wide, the main frequency is not fixed, showing “multi-peak” characteristics, and the energy is distributed in the S wave. The above identification criteria provide an effective reference for distinguishing the characteristics of non-natural earthquakes in the study area in the future.

Based on the observation data of Xinjiang Seismic Network, Wushi M_S7.1 earthquake sequence on January 23,2024 is analyzed. The results show that the aftershock activity of Wushi earthquake sequence is rich and the frequency attenuation is fast. Based on the historical earthquake sequence analogy, sequence parameters (b value, p value, h value), waiting time, magnitude difference and energy ratio, Wushi M_S7.1 earthquake sequence is judged as the main shock-aftershock type. From the early qualitative determination of historical earthquake sequence types to the tracking and determination of Wushi M_S7.1 earthquake sequence types by quantitative calculation of earthquake sequence parameters, it has certain reference function for the tracking and determination of earthquake sequence types.

In order to analyze the impact of environmental factors such as changes in terrestrial water storage in the North China Plain on GNSS nonlinear vertical time series, the North China Plain was studied with GRACE data and GNSS data supplemented by well water level data. The results show that the GNSS vertical displacement time series in the North China Plain has a good correlation with the GRACE load deformation, and the correlation between the corrected GNSS observation and the GRACE load deformation is greatly reduced. The reliability of the results is verified based on the static water level data of the well. The correlation coefficient between the GNSS vertical displacement time series after deducting the influence of GRACE load deformation and the static water level observation of the well is reduced by 40%~96.7% compared with that before deducting. Deducting the load deformation observed by GRACE from the GNSS time series can effectively reduce the impact of load deformation caused by environmental factors, including changes in terrestrial water reserves, on the non-tectonic movement caused by GNSS observations. The research results provide a scientific reference for obtaining more accurate vertical tectonic deformation in the North China Plain and its surrounding areas.

In order to study the response changes of water levels in New 55 and New 46 wells caused by Wushi M_S7.1 earthquake, the co-seismic response characteristics of water levels in observation wells were compared and analyzed, and the co-seismic response mechanism was discussed from the changes of aquifer permeability and seismic wave energy density. The results show that: 1 The co-seismic response of Jiashi New 55 well and Wushi New 46 well is mainly characterized by the rapid rise of well water level. The results of solid tide calculation and analysis show that when the seismic wave acts on New 55 well and New 46 well, the vertical hydraulic exchange of the former is enhanced, the horizontal hydraulic exchange is weakened, and the water in the aquifer is exchanged with the well water, causing the co-seismic rise of the well water level. The permeability of the latter aquifer increases, and the aquifer water exchanges with the well water, causing the co-seismic rise of the well water level. The calculation results of seismic energy density show that New 55 well is easier to trigger the co-seismic response than New 46 well, and this differential response may be related to the lithology of the well aquifer.

Since the Late Cenozoic, a large number of basalts have erupted in the Leiqiong area, and many scholars have done a lot of research on these basalts. However, the genesis of basalts and their dynamic implications remain controversial. In order to classify the Leiqiong basalts and obtain the initial melt composition and mantle potential temperature of the basalts, this paper collates the elements and Sr-Nd-Pb isotope geochemical data of the Leiqiong basalts in the literature, and divides them into four categories: alkaline basalt, olivine tholeiite, quartz tholeiite and basaltic andesite. They have geochemical characteristics similar to those of OIB, and their isotopic compositions fall in the mixed area of depleted asthenosphere mantle and type-2 enriched mantle endmembers. The enriched components are derived from subducted oceanic crust and sediments. Further initial melt recovery simulation and mantle potential temperature calculation results show that the mantle potential temperature in Leiqiong area is higher than that of normal mantle, suggesting the existence of Hainan mantle plume. Finally, it is suggested that the determination of divalent iron and trivalent iron in the samples should be strengthened in the follow-up study, so as to provide a basis for the initial melt recovery and the inversion of the properties of the mantle source region. At the same time, it is necessary to strengthen the comprehensive comparison between Leiqiong and other contemporaneous basalts around the South China Sea Basin to better explore the nature and evolution of the regional mantle.

Based on the retrospective analysis of the observation data of five geoelectric stations in Xinjiang before the Wushi M_S7.1 earthquake on January 23,2024, the geoelectric dominant azimuth of each station before the earthquake is calculated, and the data variation characteristics are summarized. It is found that the geoelectric dominant azimuth of each station before the earthquake has different degrees of abnormal changes, and the anomalies are characterized by dispersion, concentration, deflection and jump. The geoelectric dominant azimuth anomalies of Wushi and Wenquan stations near the epicenter have quasi-synchronous changes in time. Before the earthquake, the Wushi, Wenquan and Hetian stations within 500 km of the epicenter not only had quasi-synchronous decline in the correlation coefficient between different azimuths, but also had similar linear polarization enhancement in the polarization azimuth, and the abnormal changes of the dominant azimuth of Wushi and Hetian stations showed the phenomenon of concentration to the principal compressive stress P, indicating that the changes of geoelectric data observed by Wushi, Wenquan and Hetian stations before the Wushi M_S7.1 earthquake had a certain mechanism connection with the earthquake.

The seismic risk assessment of off-site roads in water conservancy and hydropower projects plays an important role in the implementation progress of the project. Road outside the engineering field in Sichuan-Yunnan area is taken as the research object, and the fuzzy set theory and the judgment matrix method are used to establish a comprehensive evaluation mathematical model of the damage of the two major factors of geological environment and seismic risk, and to analyze the possibility of road damage after the earthquake in 37 prefectures and cities. The analysis shows that the road outside the project site in Sichuan-Yunnan area is more likely to suffer from moderate earthquake damage, and the index of earthquake risk damage to the road outside the project site in Sichuan is higher than the earthquake risk assessment value in Yunnan.

The focal mechanism solution of M_S≥4.0 earthquake in Wushi M_S7.1 earthquake sequence is calculated by P-wave first motion method. The focal mechanism solution has the characteristics of good consistency in the early stage and disordered consistency in the later stage. In space, the type of focal mechanism solution in Wushi County is mostly thrust type, and the type of focal mechanism solution in Aheqi County is mostly strike-slip type. The frequency spectrum of M_S≥5.0 earthquake sequence in Wushi M_S7.1 earthquake sequence is calculated by using the digital waveform data of Xinjiang seismic network and the fast Fourier transform method. The calculation results show that the frequency spectrum of the M_S≥5.0 aftershocks in Wushi County has the characteristics of spectrum migration in the early stage, and the frequency band of the last M_S≥5.0 earthquake becomes wider, and the frequency spectrum migration characteristics disappear. The 5-magnitude aftershocks in Aheqi County all showed spectral migration characteristics.

In order to further explore whether there are short-term and medium-term anomalies in the GNSS coordinate time series before the occurrence of moderate earthquakes, the variation characteristics of the observation data of GNSS reference stations in Tashkurgan and Bulunkou of China mainland tectonic environment monitoring network before Tajikistan M_S7.2 earthquake on February 23,2023 are analyzed. It is found that there are obvious time series anomalies of GNSS reference stations in Tashkurgan and Bulunkou before the earthquake. Before the earthquake, there is a trend of W-direction movement in EW direction. After the earthquake, the E-direction accelerates, and the NS-trending S-direction movement before the earthquake. The state changes rapidly before the earthquake. After the earthquake, Bulunkou also shows a permanent deformation of 7.3 mm in EW direction. The results show that GNSS has important predictive significance in the short-term and imminent stage of earthquake. Compared with in Tajikistan M_S7.4 earthquake on December 7,2015, it is found that the influence of two earthquakes with magnitude greater than 7 on the base stations of Tashkurgan and Bulunkou is quite different. On December 7,2015, Tajikistan M_S7.4 earthquake was left-lateral strike-slip, and the direction of influence was mainly NE.On February 23,2023, Tajikistan M_S7.2 earthquake was right-lateral strike-slip, and the direction of influence was mainly SE. The baseline before the earthquake showed all the precursory anomalies. By combing the anomaly occurrence of the site, it is found that the longer the anomaly duration and the more the number of anomaly occurrences, the greater the magnitude of the earthquake may be.

In order to find out the origin of spring gas in Hainan Island and explore the relationship between springs in Hainan Island and Cenozoic volcanic activity in northern Hainan, the gas composition and nitrogen (N) isotope composition of hot springs in Hainan Island were analyzed. The results show that the hot spring gas in Hainan Island is dominated by N₂, with a content of more than 87%, and individual samples reach more than 90%, and CO₂ coexists. The δ¹⁵ values of the hot spring gas in Hainan Island are all greater than 0, and the δ¹⁵ values of the samples in the fault zone concentration area are generally larger, while the δ¹⁵ values of the samples in the relatively sparse fault zone area are relatively low, indicating that the hot spring gas is mainly controlled by the fault zone, and the main source is the crust and atmosphere. In addition, the gas composition and helium isotope characteristics of hot spring gases in Hainan Island are obviously different from those of geothermal fluids in Tengchong, Changbai Mountain and Wudalianchi active volcanic areas. The former is mainly composed of N₂, while the latter is mainly composed of CO₂. The former has high He content and low ³He/⁴He ratio, while the latter has low He content and high ³He/⁴He ratio. Based on the composition and isotope characteristics of hot spring gas, it is considered that the hot spring gas in Hainan Island is mainly derived from the crust and atmosphere, and a small amount is mixed with mantle source. The release activity of hot spring gas is a normal fault gas activity, which is not related to the Cenozoic volcanic activity in northern Hainan Island.

In order to study the consistency of data obtained by different observation methods at the same station and the same physical quantity, the horizontal pendulum and vertical pendulum of the hot spring old station are selected as the research objects to study the consistency of observation data and the response characteristics of interference anomalies in different frequency bands. The analysis results show that the observation data of horizontal pendulum and vertical pendulum of hot spring are stable and accurate, the solid tide record is clear, and there is strong consistency in the same direction of semi-diurnal wave and daily wave frequency bands. From the minute value to the tidal frequency band, the observation data of the horizontal pendulum and the vertical pendulum of the hot spring are inconsistent, and the observation data mainly contain their own attribute information ; in the annual periodic frequency band, the phase difference between the horizontal pendulum and the vertical pendulum in the EW direction is about 41 days. The phase difference in NS direction is about 14 days, and the phase lags behind the temperature. Considering the phase lag, the horizontal pendulum and vertical pendulum observations of hot springs are in good agreement, and both are linearly related to the temperature. Therefore, the temperature is the main influencing factor of the annual periodic frequency band of the horizontal pendulum and vertical pendulum of hot springs

This article is based on the constitutive relationship of rock stress. The tilt and ground strain data in the pre earthquake and surrounding 500 km range of the Wushi M_S7.1 earthquake on January 23, 2024 were used as the “response variables”. The Coulomb stress triggered model’s loading unloading response ratio method was used to calculate. The results showed that the Ush cave body strain and other three measurement items all showed pre earthquake LURR anomalies, indicating a significant stress accumulation process in the source area medium. At the same time, it also indicates that the tilt and Effective information for earthquake prediction can be extracted from the tidal frequency band of strain.

On July 20,2022, an M_S4.8 earthquake occurred in Changji, Xinjiang. The Xinjiang earthquake early warning system is in the test operation stage. The early warning results of the earthquake event are output, and the data are only internally referenced. Comprehensive analysis of the early warning results of the event (JEEW, FJEEW and fusion system output), compared with the official earthquake rapid report results of the China Earthquake Networks Center, the first report of the JEEW system takes 7.1 s, the magnitude deviation is -0.7, and the epicenter deviation is 3.3 km. The triggering time of the first report of the FJEEW system is 7.5 s, the magnitude deviation is -1.1, and the epicenter deviation is 3.4 km. The first report of the early warning fusion system was released 7.8 s after the earthquake, the magnitude deviation was -0.7, and the epicenter deviation was 3.3 km. The magnitude and epicenter of the three sets of earthquake early warning systems were in good agreement. For this earthquake event, the accuracy of the timeliness, magnitude and epicenter results of the earthquake early warning system meets the requirements of construction goal.

Using the time series of GPS continuous observation stations in Xinjiang as the data source, Hilbert Yellow transform (HHT) was used to capture the microdynamic anomaly changes of ground surface displacement in the short and medium term before the M6 or above earthquake in Xinjiang. Taking the M_S6.6 Jinghe earthquake on August 9, 2017 in the North Tianshan Seismic belt as an example, through the source mechanism solution, baseline time series and HHT single time series analysis, the HHT filter frequency band is 3.858 0×10^-7~6.430 0×10^-8Hz (period 30-180 days). Some short-term precursor anomalies and seismogenic information were extracted 40 days before the earthquake. Using this frequency band, the Aketao M_S6.7 earthquake on November 25,2016 in Xinjiang was analyzed. About 55 days before the earthquake, the amplitude, amplitude coherence function value and correlation coefficient of the two related stations near the epicenter showed micro-dynamic changes of displacement significantly higher than the background level. Two seismic events show that it is possible to extract valuable micro-dynamic characteristics of pre-seismic displacement and earthquake preparation information from GPS continuous observation data in a one-year time scale, which provides a reference for earthquake trend analysis.

Collect 130 destructive earthquake events with intensity data from 1716 to 2022, supplement the recent destructive earthquake intensity data in Xinjiang, and classify 124 seismic intensity maps and 281 pairs of intensity circle long and short axis data. The mathematical method is used to fit the seismic intensity attenuation model of different time nodes and different focal mechanisms in Xinjiang. It is found that in the process of intensity attenuation, strike-slip and reverse-fault earthquakes are slightly different. Different seismic source rupture properties will affect the long and short axes of intensity attenuation relationship. Therefore, we can use it as a correction factor to quickly evaluate the intensity influence field of earthquake disasters. After the earthquake occurs, the long and short axis data of the intensity circle can be modified and improved to evaluate more accurately.

In view of numerous and redundant factors affecting earthquake magnitude, in order to predict earthquake magnitude effectively, a seismic magnitude prediction model based on support vector machine (SVM) optimized by grid search method was proposed. Selecting 7 influencing factors, including cumulative earthquake frequency, cumulative released energy, b-value, number of abnormal earthquake swarms, number of seismic bands, activity period, and magnitude of related areas. Principal component analysis (PCA) was used to remove redundant information between factors, and the input dimensions was reduced, and grid search method (GSM) was used to determine SVM parameters C and g, finally the magnitude prediction model was established, which was used to predict test samples, and compared with the prediction results of Genetic Algorithm (GA) and Particle Swarm Optimization (PSO). The results showed that the average relative error of PCA-GSM-SVM was 1.29%, which had higher prediction accuracy.

Based on New 09 spring, New 10 spring and New 15 spring with water radon concentration of 20 000～100 000 Bq·m^-3, the standard instrument transfer calibration experiment was carried out by using the international scale reference device Alpha GUARD radon measuring instrument and its water radon measuring component. The relative errors of calibration K values were 3.60%, -0.81% and 2.09%, respectively. The comparison between the experimental results and the calibration results of radon gas solid source shows that the water samples with water radon concentration above 20 000 Bq·m^-3 can be tested by the new calibration method of standard instrument, and the use of spring water with different water radon concentration will not affect the accuracy of the calibration results. The Alpha GUARD radon measuring instrument can be used as a standard instrument to calibrate the FD-125 radon and thorium analyzer by using the daily monitoring spring with high radon concentration in the Xinjiang Seismic Underground Fluid Comprehensive Station, so as to replace the calibration of solid radon source. This study provides data support for the operation technical regulations and promotion trial of the new calibration method for radon observation in seismic monitoring.

Huoerguosi-Manas-Tugulu fault plays an important role in the Cenozoic tectonic evolution of Tianshan Mountains, and controls the seismic activity in the piedmont area of the northern Tianshan Mountains. It is of great significance to understand the activity characteristics of different sections of Huoerguosi-Manas-Tugulu fault zone for the movement characteristics of the piedmont depression of Urumqi. GPS stations in the study area are used to obtain the current GPS velocity field, baseline length change, strain and other results in the region. Then, the profile projection method of GPS velocity field is used to analyze the cross-fault leveling data. The results show that the Tianshan Mountains are in a squeezed state through the change trend of the baseline of the terrestrial network station. The baseline variation of the geodetic quadrilateral network shows that the Dafeng survey area of the Tugulu anticline is in a state of extrusion from 2017 to 2021, and there is a trend of tension from 2021 to 2023, which is consistent with the trend of the cross-fault leveling results of the site. The fault in the Hongshanzui survey area has always been in a squeezed state, which is the same as the measurement results of the regional cross-fault leveling site. The GPS velocity profile of the cross-Horgos-Manas-Tugulu fault shows that the north-south velocity of the GPS station decreases from west to east, and the slip rate of Horgos-Manas-Tugulu fault is about 1 mm/a.These faults are thrust characteristics, and the strike-slip component has no obvious change.

In order to provide reference and help for the identification of interference, the determination of anomalies, the analysis of data and the construction of stations in the fault hydrogen observation of Akesu in Xinjiang, through the interference of meteorology, man-made, power supply and observation system in the fault hydrogen observation of Akesu, the system analysis and summary are carried out from the aspects of interference form, correlation, interference amplitude and influence duration, and the typical power supply interference is carried out. It can be seen that the variation characteristics of different interference factors are obvious, and it is easier to distinguish them through systematic comparison and analysis in daily observation. According to the relevant experiments on typical power supply interference, the main factor of the increase of fault hydrogen concentration caused by power supply comes from the influence of UPS on the charge and discharge of storage battery. The characteristics of the increase of fault hydrogen concentration caused by power supply interference are as follows: the duration and the increase amplitude are relatively limited, the duration is generally within 20 h, and the increase amplitude is correlated with the observed background value.

Deformation observation located on the interface of each circle and layer has not only the information from the stress accumulation inside the earth,but also the influence of various factors outside the earth,which has rich connotation of mathematics and physics.Based on the characteristics of comprehensiveness and separability of deformation measurement value series,this paper analyzes Wenquan boday strain,air temperature,water level and air pressure in frequency domain,decomposes the time series value,and studies the influencing factors of different frequency bands of wenquan body strain. The results show that (1) influence of air pressure on the body strain of wenquan mainly has two frequency bands: Monthly wave between 2～4 hours and 1～2 months; (2) The main factor affecting the annual periodic frequency band of wenquan body strain is the water level,and the phase lags behind the water level by about 29 days; (3) The influence factor of daily wave and semidiurnal wave band of Wenquan body strain is solid tide.

On January 19,2020, the Jiashi M_S 6.4 earthquake occurred near the Keping nappe in the west of the southern Tianshan Mountains in Xinjiang. The analysis of the Keping ground resistivity observation data at 169 km from the epicenter shows that since October 2017, the two-component ground resistivity observation values of the Keping station have shown obvious abnormal rate changes. The NS-direction abnormal change range is -2.33%, and the EW-direction is -0.72%. At the same time, the two components showed anisotropic changes, and the anisotropy S decreased rapidly. In order to explore whether there is a mechanical mechanism between the Keping ground resistivity anomaly and the Jiashi M_S 6.4 earthquake, this paper calculates the distribution of stress and strain in the observation point area before the earthquake by the fault virtual dislocation model, and combines the P-axis direction calculated by the focal mechanism solution. It is found that the abnormal change of Keping ground resistivity before the earthquake is related to the earthquake.

In order to provide direct and objective measurement for the scientific analysis of blasting effect, the monitoring data are obtained comprehensively and truly by using seismic professional instruments, and the factors related to blasting effect are found out, and the risk prevention measures are put forward. Starting from the key parameters such as blasting vibration velocity, energy attenuation and dominant frequency, the H/V spectral ratio method is used to evaluate the influence of site response. The blasting magnitude is used to verify and check the blasting energy, and the energy attenuation law in this area is obtained by fitting. The energy distribution and dominant frequency law are obtained by waveform time-frequency analysis. Through the monitoring and analysis of mine blasting, it is concluded that the blasting energy, intensity, velocity and acceleration decrease with the increase of distance. The intensity increases with height on different floors of the same building; The maximum vibration speed recorded by the instrument is lower than that specified in Blasting Safety Regulations; Blasting has little effect on the earthquake damage of the surrounding buildings, but it is necessary to consider the long-term impact of blasting vibration on the self-built brick and earth house, and the long-term impact on the decoration and external tiles of the brick and concrete house. The monitoring test shows that it is feasible to develop the method of seismic effect monitoring and impact analysis of blasting, and the results can be used to guide mine safety production.

The instrument used to measure radon in the underground fluid chamber of the Geophysical Observation Center of Earthquake Agency of Xinjiang Uygur Autonomous Region is FD-125, which was purchased in 1979. Due to the serious aging of the instrument for a long time, there is no spare instrument and no manufacturer to replace it. If the instrument fails to be repaired in time and there is a lack of spare observation instruments, it will cause data disconnection and affect the overall scientific quality of observation data. Therefore, in this paper, the water sample of Shuimogou 15 spring in Xinjiang is taken as the measurement object, and the DDL-2 radon detector is introduced to detect and compare with the FD-125 radon detector under the same environmental conditions. The results show that the DDL-2 radon monitor has stable performance and small fluctuation range of measured values, which can meet the requirements of precursory observation specifications and correctly reflect the change of radon content in groundwater. It is considered that the DDL-2 radon monitor has the potential to replace the FD-125 radon monitor as the daily measurement instrument of water radon.

The seismic data recorded by ultra-wideband seismometer JCZ-1T of Chengdu Earthquake Monitoring Center Station were studied, and it was found that there were low-frequency and long-period fluctuation in the data. The comparative analysis between the sluice experiment of hydropower station and the real-time waveform in the period of low-frequency long-period fluctuation proves that there is a direct correlation between the long-period fluctuation and the flushing operation of Hydropower Station., and it is obtained from the experiment that the two important factors affecting the shape change of low-frequency long-period waveform are the sluice time and the sluice scale respectively. According to the experimental results, it is considered that the low-frequency and long-period fluctuation reflects the “oscillation” process in which the water level and water flow rate change sharply and gradually return to calm during sluice.

Based on the measured shear wave velocity data of 260 boreholes in Weinan City, the relationship between shear wave velocity and depth of common soil types in this area is statistically regressed according to the site category by using the first-order function, second-order polynomial and third-order polynomial models. By comparing the goodness of fit, the optimal fitting regression relationship is the third-order polynomial model. The prediction accuracy of the optimal model is verified by comparing the predicted wave velocity of the reserved borehole with the measured shear wave velocity. At the same time, the influence of rock and soil types and site types on the prediction accuracy of the model is studied. The results show that distinguishing lithology and classifying site types can reduce the relative error of the predicted wave velocity to a certain extent and improve the prediction accuracy of the model. Taking loess and silty clay as examples, the predicted values of wave velocity obtained by the recommended model and the literature model of the same loess site are compared. It shows that the statistical relationship model between shear wave velocity and soil depth has obvious regional characteristics, and the type and depth of rock and soil also have certain influence on the regional adaptability of the model. When the measured data of shear wave velocity cannot be obtained in practical work, the statistical model of the region should be preferred.

For the determination of the focal depth of moderately strong earthquakes, the teleseismic converted wave depth phase pP and sP sounding is an effective method, and the depth accuracy can reach 2 km when the depth phase is clear. Teleseis program is used to fit the theoretical seismogram of the Maduo M_S7.4 earthquake, and compared with the actual observation. The focal depth of the earthquake is measured, and the influence of the crustal velocity model on the teleseismic body wave depth phase pP sounding is analyzed and discussed. The results show that the initial rupture depth of the Maduo earthquake is 12 km, and the uncertainty of the V_p in the velocity model has a greater influence on the arrival time of the seismic phase in the theoretical seismogram.

In order to solves the problems of fully automatic real-time monitoring of different instruments in the station and the summary of observation data,a software for automatic real-time monitoring of seismic precursor instruments, SMS Seismic Instrument Operation Monitoring and Alarm System, was designed and developed.Based on the advantages of MATLAB language for data processing, combined with FTP transmission protocol and GUI graphical interface technology, adopting the object-oriented modular programming method, it realizes the functions of alarming the operation status and threshold value of observation instruments, data backup and saving, real-time drawing display. Meanwhile, the software is easy to operate and set up, with high portability and good interactivity, and has been successfully applied in many seismic stations near Zhangjiakou.

Observation data of three sets of VP broadband vertical pendulum tiltmeter at Korla station, Ruoqiang station and Qiemo station are selected, and the seismic noise level in the seismic frequency band is calculated by using the power spectral density analysis method. The results show that the background noise level of the instrument at Korla station is low due to the excellent observation conditions of the cavern and the small interference of the observation environment around the cavern. The noise level of the three sets of VP-type broadband vertical pendulum tiltmeter does not show obvious regularity in spatial distribution, but it shows the consistency that the NS component record is better than the EW component.

The common meeting modes, application scenarios, advantages and disadvantages of each mode of Xinjiang earthquake emergency video conference system are introduced. The common hardware equipment, software, network fault performance characteristics and daily examples of video conference system are analyzed. Taking the troubleshooting and cause analysis of Baolitong MCU group meeting as an example, this paper puts forward the troubleshooting process of video conference. This fault shows that the MTU setting value of different hardware devices has a certain influence on the network transmission efficiency. In order to provide reference for future network fault investigation.

Through the field geological and geomorphological survey and trench excavation of the Danghe nanshan fault,it is found that multi-level fault scarps are developed along the north side of the fault, and the latest scarps break the floodplain of the gully, while the west section of the fault is accompanied by fold activity; The geological exploration trench excavated at the mouth of Dahonggou gully shows that the fault has dislocated a relatively new gravel layer. The sample test results show that the latest active age of the fault is at least the middle Holocene; Two trenches revealed the same seismic event, which occurred after (4.69±0.40) ka BP.

Based on the existing four-dimensional disaster volume mode, this study applied and analyzed the model by incorporating factors related to earthquake disasters. The disaster volume index of destructive earthquakes in Xinjiang from 2002 to 2022 was calculated to further classify disaster levels. To verify the accuracy of the model, the calculated results were compared with the results of a previously established three-dimensional disaster volume mode, and the disaster losses of the Wenchuan and Tangshan earthquakes, as well as other earthquakes, were calculated. The research results showed that under the consideration of richer disaster information, the calculation results of this model were more accurate and matched the actual situation of disaster losses.

In depth analysis of the activity characteristics, sequence parameters, and sequence types of the Wushi M_S7.1 earthquake sequence on January 23, 2024 shows that the aftershock sequence of the Wushi M_S7.1 earthquake is rich, and the intensity of seismic activity decays slowly, showing a fluctuating attenuation characteristic; The overall attenuation of earthquake frequency is relatively fast. The aftershocks are mainly distributed at the junction of the basin and mountains, with a length of about 200 km and a width of about 150 km, and are generally distributed in the NE direction. Before 4 strong aftershocks with M_S＞5.5, there was a certain degree of low p-values and h-values. Based on the analysis of the energy release ratio, b-value, and the difference in magnitude between the main shock and the maximum aftershock of the largest earthquake in the sequence, the Wushi M_S7.1 earthquake sequence on January 23, 2024 belongs to the main shock aftershock type.