There have been 93 destructive earthquakes of M_S≥5 in Xinjiang from 2000 to 2019, and earthquake damage is very serious. Characteristics of earthquake damage and the differences of seismic performance of buildings in earthquake are related to house structural form. Based on the analysis of the seismic damage data of houses in agricultural and pastoral areas and the relevant data of house investigation in typical destructive earthquakes over the years in Xinjiang, according to the characteristics of house seismic damage, combined with the building age, structural form, structural measures, masonry binder materials, construction quality and building material strength and other factors affecting the seismic performance of houses, the structural types of houses in agricultural and pastoral areas in Xinjiang are divided into civil wooden frame-stone-wood simple structure, brick wood structure and brick concrete structure are classified into three categories, and subdivided into 10 sub categories. The seismic damage characteristics of buildings with detailed classification are summarized, and the reasons affecting the seismic performance of buildings with various structural types are analyzed. The seismic damage data of destructive earthquakes in Xinjiang over the years show that, in addition to the seismic performance factors of buildings of various structural types, site engineering geological conditions, earthquake and other natural disasters are also the main factors causing the deterioration of buildings.

Characteristics of disaster bearing bodies in Xinjiang cities and towns are classified by using the sampling survey data of kilometer grid unit. Through the historical earthquake damage characteristics of Xinjiang cities and towns, combined with the calculation of plot ratio and integrity ratio in the sampling unit, the seismic capacity and earthquake damage risk points of urban buildings are preliminarily analyzed, and the earthquake damage prevention suggestions are given.

After studying the geomorphology, geological structure, historical earthquakes and geological disasters in the Yili area, we analyze the geomorphology, stratum lithology, terrain slope and other seismic landslide influencing factors by logistic regression model method. Using the spatial analysis characteristics of ArcGIS and the statistical function of SPSS software, the seismic landslide risk model and landslide risk distribution map in Yili area are obtained. It is studied that the areas with higher earthquake landslide risk in the Yili area are mainly located in Tekes County, Nileke County, Gongliu County, and Xinyuan County, and the lower areas are located in Huocheng County, Zhaosu County and Chabuqal Xibo Within the autonomous county. In addition, the area of extremely high risk area accounts for 1% of the total area of Yili area, the area of high risk area accounts for 6%, the area of medium risk area accounts for 18%, the area of low risk area accounts for 39%, and the area of extremely low risk area accounts for 37%. The results can provide a reference for the field investigation of the earthquake, post-disaster reconstruction, and site selection.

Wusunan fault was originated between Dushanzi reverse fault (the third group) and west lake uplift (the fourth group) in front of Northern Tianshan, it was made up of 4～5 near parallel fault scarps according to satellite map.Since the late Quaternary, the fault activity has been obvious. Along the fault, the alluvial proluvial fan, gully and water system in front of the mountain have been staggered, forming a linear scarp landform with intermittent distribution. The excavation of geological trench shows that Wusunan fault group is a high dip reverse strike slip fault. In the age of fault dislocation geomorphic surface, it is estimated that the vertical activity rate of the fault since late Pleistocene is about 0.125 mm/a, and the dextral strike slip activity rate is 1.25±0.02 mm/a. According to the location and structural characteristics of Wusunan fault zone, it is inferred that the fault is probably an over conversion fault between the third and fourth anticlines in front of Tianshan Mountains.

This paper describes in detail the main structure of the Xinjiang Early Warning System. Firstly we introduced the station observation system, early warning data processing system and information release system in detail. Secondly, the effectiveness of Xinjiang Early Warning Network after its completion was assessed in terms of the first warning time, monitoring ability and the minimum magnitude of warning, respectively. Finally, the performance of each system deployed in the Xinjiang Early Warning Network was analyzed in detail using a specific earthquake case as an entry point, and the related reasons were analyzed to propose further work to be carried out in the future. With the official operation of Xinjiang Early Warning Network, the system will play an important role in earthquake prevention and disaster reduction in Xinjiang.

By applying correlation analysis and wavelet analysis methods, the relationship and influencing mechanism between air pressure, water level, and Yushugou component strain were studied. The results showed that: (1) water level is the main influencing factor for the long-term variation of Yushugou component strain, especially for the EW and NE directions of component strain, which have a significant impact, showing a medium to high linear negative correlation; From 2016 to 2018, the phase lag water level in the EW direction was about 1 d, and the phase lag water level in the NW direction was about 8 d; From 2019 to 2021, the phase lag water level in the EW direction is about 4 days, and the phase lag water level in the NW direction is about 7 days; (2) Air pressure is the main influencing factor for the short-term variation of component strain, and the EW and NW directions are more sensitive to its response, exhibiting a medium to high linear negative correlation; There is no phase lag between the EW direction and the air pressure, while the NW direction has a phase lag of about 55 minutes for the air pressure; (3) The wavelet analysis results show that the significant frequency bands of the influence of air pressure on the EW component are 2⁶～2⁸ min and 2¹⁰～2¹⁵ min, and the significant frequency bands of the influence on the NW component are 2⁶～2⁸ min and 2¹¹～2¹⁴ min.

On January 30, 2023, the M_S6.1 earthquake with focal depth of 50 km occurred in Xayar County (82.29°E, 40.01°N), Xinjiang. Before the earthquake, the electromagnetic discipline group of short-term and imminent earthquake prediction tracking of China Earthquake Administration and the electromagnetic discipline group of Earthquake Agency of Xinjiang Uygur Autonomous Region sorted out the anomalies of the data of electromagnetic stations in Xinjiang according to Manual of Seismic Electromagnetic Analysis and Prediction Technical Methods, Manual of Seismic Analysis and Prediction Technical Methods in Xinjiang and List of Seismic Electromagnetic Analysis and Prediction Methods, and found that there were mobile geomagnetism multiple anomalies such as geomagnetic vertical intensity polarization, daily geomagnetic ratio, and geomagnetic low point displacement. The comprehensive prediction opinions of anomalies before earthquakes are basically consistent with the actual earthquakes. The evolution characteristics of medium and short-term progressive anomalies before earthquakes are prominent. The construction of the prediction index system of seismoelectromagnetic discipline in Xinjiang from 2017 to 2020 has achieved initial results.

Collect and organize global earthquake catalog with a magnitude of 6 or above and China's earthquake catalog with a magnitude of 5 or above in 2022, as well as data on casualties and damage to buildings and lifeline projects. Compare the seismic disaster data of the past decade, analyze the global seismic activity and characteristics of domestic and foreign seismic disasters this year, and conduct a preliminary analysis of the causes of the disasters. Based on the emergency response situaition of typical earthquake disaster events, this paper summarize the achievements and challenges faced in earthquake disaster prevention and response.

Jiujiawan faults are located in Jiujiawan middle Pleistocene gravel terrace and the faults are very clear in the image.The fault extends to the young geomorphic surface on the East and west sides, and the surface trace is not significant.Based on the extending direction of the Jiujiawan faults (F₂), the trenches are excavated in the southwest and we find the active trace of fault. Moreover we analyze the west terminal deformation characteristic of Jiujiawan faults. The fault’s terminal only grows up the main normal fault which dips north and the fault is nearly a fissure. The vertical offset is 3 to 25 centimeters. The fault lies hidden in the earth about 1 meter. It displays that the width, active degree and deformation range are all decreasing in Jiujiawan faults’ west terminal. This study provides forceful materials with the seismic risk assessment on the faults’ terminal related areas.

Polarization value of the vertical component of FHDZ-M15 geomagnetic second data at Kashi Station is calculated by the polarization method, and the relationship between the abnormal amplitude of the polarization value, Epicentral distance, abnormal duration and the corresponding earthquake magnitude is quantitatively studied. The results show that: ① there is a good correspondence between the high polarization value anomaly and M_S≥5.0 earthquakes in the surrounding area of the station within the next 4 months, with high value anomalies lasting mostly for 3~6 days; ② The relationship between the magnitude of the corresponding earthquake and the Epicentral distance is quasi linear, and the correlation coefficient reaches 0.791; ③ According to the analysis of Epicentral distance, the significant relationships are 0~150 km and 150~250 km, and the correlation coefficients of anomaly duration and corresponding earthquake magnitude are 0.645 and 0.702 respectively. The correlation coefficient between anomaly amplitude and magnitude is 0.717 within 150~250 km. Over 250 km, the correlation coefficient between Epicentral distance and magnitude is 0.687; ④ According to the magnitude analysis, M_S6.0~6.9, the magnitude is moderately negatively correlated with Epicentral distance, and the correlation coefficient is -0.685.

On January 18 and 19, 2020, three earthquakes with M_S≥5.0 occurred in Payzawat County, Kashgar Prefecture, Xinjiang, including M_S6.4 earthquake in Payzawat County at 21:00 on January 19. In order to better understand the characteristics of the strong motion records of this earthquake, this article analyzed the strong motion records of this earthquake sequence. From the waveform of the records, the Sikker strong motion station located in the near field area obtained larger peak accelerations, especially with obvious pulse peaks in the vertical direction and obvious pulse ground motions in the horizontal direction. The pulse period was about 2.78 seconds, and the peak velocity pulses were 38.1 cm·s^-1 and 36.4 cm·s^-1respectively, which reflected the directional effect of fault rupture. Using the spectral ratio method to analyze the amplification of the site, there is a basic resonance period around 2 seconds; By comparing with the design response spectrum of Payzawat County in Kashgar Prefecture, the response spectrum of horizontal ground motion of Xikel station is much higher than that of 8 degree rare earthquake in Kashgar Prefecture.

In this paper, the electron density of N_e in the top ionosphere of Xinjiang region (30°～55°N, 70°～100°E) is analyzed by using the in-situ electron density of the LAP load of the Zhangheng-1 electromagnetic satellite in the period of magnetically quiet days in summer. By analyzing the data variation curves of the day side and night side, it can be concluded that the electron density of N_e changes steadily within the range of 40°N to 55°N, and the daily N_e value is on average twice higher than the night side N_e value. The night side is stable in the range of 0.5×10¹⁰ cm^-3～1.0×10¹⁰ cm^-3, and the day side is stable in the range of 1.0×10¹⁰ cm^-3～1.5×10¹⁰ cm^-3. However, the data of Ne electron density in the region of 30°N~40°N fluctuates greatly. According to the analysis of local time characteristics, the N_e value gradually increases with the decrease of latitude, whether on the night side or the day side. N_e value reaches maximum 5.25×10¹⁰ cm^-3.The diurnal and nocturnal sides of N_e electron density in the study area have significantly different characteristics in different latitudes and different places.

In response to the problem of identifying dam modal parameters from measured strong motion records on earth-rock dams, a nonlinear modal parameter identification method for earth-rock dams was constructed based on strong motion data recorded at monitoring points during earthquakes and a nonlinear auto regressive neural network NARX model with external inputs based on polynomial approximation. The transfer function between nonlinear dynamic response and excitation input of earth-rock dams was studied,and then applied to the calculation of modal frequency and modal damping ratio of the 0+220 section of the main dam of the Kezier earth rock dam in Xinjiang, and evaluated the operational status of the Kezier dam based on the calculation results and actual engineering operation. Theoretical analysis and engineering examples have shown that this method has high accuracy, and the identified transfer function can reflect the dynamic characteristics of earth-rock dams, which has important theoretical research significance and engineering practical value.

This paper introduces the basic parameters, tectonic background, aftershock sequence, construction engineering, surface damage, and seismic damage characteristics of the Bachu Jiashi M_S6.8 earthquake on December 24, 2003. It reviews the emergency rescue actions, recovery and reconstruction situation of governments, departments, and industries at all levels after the earthquake, and discusses the effectiveness of earthquake relief work and its demonstration role in the construction of rural earthquake resistant and safe housing projects nationwide.

Discusses the principle of cumulative detrending method and illustrates its application effect in deformation analysis with examples. Precipitation of the same site at the flow level, the station level and the flow gravity single station are calculated by the cumulative de-trend, and then compared with the observed data respectively. It is found that the original abrupt change is removed in the treated precipitation change line, which increases the influence of precipitation in the subsequent time, and the precipitation is more consistent with the normal trend of deformation. According to the corresponding relationship between the precipitation changes after treatment and the deformation trend, it is also easier to judge whether the deformation has abnormal changes.

The consistency and reliability of Jiji Station component drilling strain observation system were evaluated through the continuity of observation data, accuracy of tidal factors, self consistency test, relative field calibration, and analysis of main interference factors. The results show that: ① the continuity of the observation data is high, and the accuracy meets the standards of Class I deformation stations, but the self consistency test results of the observation data are relatively poor, and are not suitable for relative field calibration; ② Temperature and water level are the main interfering factors, and the sharp fluctuations in water level from June to September can easily lead to inaccurate data.

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.

Using the principle of db4 wavelet transform analysis, the fault gas radon observation data from Maoji, Mayao, and Yuanjiazhuang stations in Tianshui, Gansu from 2021 to 2022 were analyzed, and the low-frequency and high-frequency components in the data were effectively separated. The results show that the wavelet transform method has strong recognition function for information at different frequencies, and can reflect earthquake precursor anomalies intuitively and significantly. Combined with earthquake case studies, wavelet analysis is an effective method for eliminating noise in fault gas radon observation data and identifying short-term anomalies in earthquakes.

Previous studies performed detailed surveying that Wuqia M_S7.4 earthquake on August 23th,1985 ruptured 15 km on Kazikalte fault. In this paper we determine that it also ruptured 24 km on Wuqia Basin South fault, thus this event ruptured the full 39km long. The maximum vertical offset of Wuqia Basin South fault surface rupture zone is 1.2 m, the minimum vertical offset is only 0.2 m, and the average vertical offset is 0.55~0.64 m. These fault scarps are only slightly uplifted on the surface, which are usually difficult to identify by naked eyes, so they are also important reasons for the failure to discover them in time after the earthquake.The excavation of the trench reveals that the reverse fault dips south and the dip angle of the fault is only 20°, and the calculated average horizontal shortening offset is 1.51 to 1.76 m, and the average dip-slip offset is 1.61 to 1.87 m. Wuqia Basin South fault has the same active properties and equivalent offset as Kazikalte fault. The projection in the north-south direction of the maximum principal compressive stress shows that the two rupture zones are basically non-overlapping, which the strain energy in the western part of the epicenter was released by Wuqia Basin South fault ruptured and the strain energy in the east was released by Kazikalte fault ruptured, implies the close structural relationship between Wuqia Basin South fault and Kazikalte fault. These two faults are likely to merge into the same weak gypsum-salt detachment surface in depth, both of which belong to the thin skin structure of the Pamir subduction zone.

Based on seismic data from 1920 to 2020, b value of the Qaidam Altun seismic belt was calculated and analyzed with multiple schemes (different time periods and magnitude periods), the b value was determined to be 0.78.It is lower than the value of 0.84 in engineering earthquakes comes from “Seismic ground motion parameters zonation map of China”, which is of great significance for seismic safety evaluation of major construction projects in seismic zones and engineering fortification of seismic zoning.As a supplement to “Seismic ground motion parameters zonation map of China”, b value determined in this paper can provide a scientific basis for the establishment of seismic hazard calculation model of major infra-structure.

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.

Based on the teleseismic waveform data recorded by Xinyuan Seismic Station from 2016 to 2020 with a Epicentral distance of 30°~90°, the teleseismic P-wave receiver function is extracted by time domain iterative deconvolution method, and the crustal thickness and Poisson’s ratio under the station are calculated by using a generalized receiver function H-k stacking method H-k-c with harmonic correction. The results indicate that the H-k-c method significantly improves the estimation of crustal thickness and Poisson’s ratio, with an average crustal thickness of about 56.3 km and a Poisson’s ratio of about 0.25 below Xinyuan Seismic Station.

As the seismotectonic environment is an organic whole, it is necessary to comprehensively consider in combination with the geotechnical hydrothermal structural belt, systematically summarize the relevant studies in the old seismic area of Xingtai since 1986, and study the tectonic environment of Xingtai M_S7.2 earthquake in combination with the stratification of the old seismic area, including caprock, basement and focal layer. The morphological characteristics of the intensity line of Xingtai M_S7.2 earthquake are related to the neotectonic pattern, and the seismic tectonic environment can also have an impact on the creep ground fissures.

In order to study the characteristics of the geological disasters caused by 1812 Nilek earthquake in Xinjiang, this paper interprets the main geological disasters along Kashgar River using multi-source, multi time domain, and multi-scale remote sensing images, visually interprets and quantitatively extracts the ground temperature anomalies through remote sensing, and provides detailed interpretation of seismic faults with multi-source and high resolution. A comprehensive discussion is conducted based on the interpretation results of seismic and geological disasters, fault characteristics, geothermal anomalies, aeromagnetic anomalies, etc. The results provide a certain reference for basic geological research in Kashgar River Basin.

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.

This paper introduces the basic geographical information, structure and seismicity, historical earthquake integrated isoseismal contours and other basic information about Artux City, Xinjiang. Based on the building data obtained by UAV remote sensing in the urban area of Artux City, the risk of earthquake disaster in the urban area is preliminarily analyzed using the deterministic and probabilistic risk analysis methods, and the basic suggestions for earthquake disaster prevention are put forward.

Using soil shear wave velocity data and strong motion records, the 1/4 wavelength method and horizontal vertical spectral ratio method were used to obtain the amplified response curve of the Xikele Town site. By comparison, it was found that the 1/4 wavelength method can better estimate the amplification response of the site, but cannot accurately estimate the predominant frequency of the site; The horizontal vertical spectral ratio method can better estimate the dominant frequency of the site, but the resulting amplification response of the site was relatively small. In the research area, the horizontal to vertical spectral ratio method estimated that the site amplification response was about 1～2.5 times smaller, especially when the period was within the range of 0.08～0.2 s, the site amplification response was about 2.5 times smaller.

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.

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.

Based on the “China Earthquake Examples” (1966～2018), the characteristics of ground fluid precursor anomalies before earthquakes in Xinjiang region were systematically analyzed, and the prediction effectiveness of different magnitude ranges was tested for each measurement item. The results show that the number of ground fluid anomalies in Xinjiang is mostly concentrated in 100～200 km, and the duration of anomalies is mostly within half a year before the earthquake; The average number of ground fluid anomalies in Xinjiang during earthquakes with M_S≤6.5 is 4; The monthly frequency of anomalies before earthquakes is mainly manifested as a “sustained growth” type and a “first increase then decrease” type; Xin10 and Xin04 measuring points are abnormal “sensitive points” in ground fluid observation points in Xinjiang, and their location and vicinity can be considered as structural “sensitive areas”; The R value scoring method was used to test the prediction effectiveness of each measurement item, and the results showed that the R value results of different magnitude ranges were conducive to analyzing and extracting anomaly indicators suitable for the corresponding magnitude.

Tianshan is a typical intracontinental orogenic belt. The study of the structural deformation characteristics in Tianshan is helpful to understand its deformation process and strain distribution. At present, the study of active tectonics in Tianshan mainly focuses on the basin mountain junction, however, the study of active faults in Tianshan is rare. This study focuses on the baoertu fault, the boundary fault between South Tianshan and Tarim plate. Through remote sensing image interpretation and field geological survey, it is found that baoertu fault is a NWW trending left lateral strike slip fault with thrust characteristics, with a total length of 400 km. It is a regional deep fault,and controlled the formation of Xiaouludus basin and the modern valley. According to the geometric distribution of the fault, it can be divided into two parts: East and West. In Heshuo—Hejing section, the fault is linear and straight, and the multi-stage geomorphic surface since the late Quaternary is staggered. The maximum vertical displacement is 9.6～10.7 m, and the minimum vertical displacement is 0.8～0.9 m. The horizontal slip rate of the fault since late Pleistocene should be consistent with the sinistral slip rate of Kumish basin in the eastern segment of the fault, about 0.56 mm/a. The latest fault activity is located in the water system T1 terrace, which is a Holocene Active fault.

Deformation observation station is established on the surface of the Earth’s crust, at the interface of various layers, and is affected to varying degrees by various influencing factors. To study the influence characteristics of different frequency bands of Wushi body strain on interference factors. Using spectral analysis to study the main periodic components of Wushi body strain, and using methods such as Bertsev filtering and general polynomial fitting decomposition to decompose the Wushi body strain measurement sequence, the factors affecting Wushi body strain under different frequency bands such as temperature, atmospheric pressure, and solid tide are studied. The results indicate that: ① water level is the main influencing factor of the monthly wave frequency band of Wushi body strain; ② The main influencing factor of the annual frequency band of Wushi body strain is temperature, and the phase lag of Wushi body strain is about 314 days behind the temperature; ③ The frequency band of the influence of atmospheric pressure on the strain of the Wushi body is between the tidal and lunar wave frequency bands; ④ There is a strong linear correlation between various influencing factors and body strain.

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.

From 2020 to 2021, destructive earthquakes of magnitude 5 or above occurred twice in the same tectonic area on the northern margin of Baicheng Basin in the western section of Kuqa Depression, causing a large number of house damage and casualties, especially Baicheng M_S5.4 earthquake on March 24, 2021, which not only caused a large number of buildings to be damaged and several people died. A 4 km long sinistral strike-slip coseismic surface rupture zone has also been found at the western slope of the Tuzimaza anticline in the northern margin of Baicheng Basin. According to the geological survey of earthquake epicenter, an N-dip thrust fault developed on the southern flank of TuziMaza anticlinal belt, along which the piedmountain diluvial fan and river terrace have been dislocated since 79.9±9.6 ka, and the vertical fault activity rate since late Quaternary is 0.16 mm/a. By comparing the aftershock sequence, focal mechanism and surface rupture characteristics of the two earthquakes, it is concluded that the seismogenic background of the two earthquakes is the same, the fault type is the same, and the cause may be caused by the brittle rupture of the salt bearing structure in the anticlinal interior under the compression environment, and the tectonic origin should belong to the “compression salt tectonic earthquake”.At the same time, because the compression salt structure is usually buried at a shallow depth, it can produce shallow source and ultra-shallow source earthquakes, which is one of the main reasons for the unusually severe damage caused by the two M5 earthquakes in Baicheng.

In order to understand the focal structure and stress characteristics of Baicheng M_S5.4 earthquake in Xinjiang on March 24, 2021, the focal mechanism solution of Baicheng earthquake is inversed by CAP method using the waveform recorded by wide-band seismic stations within 210 km of the epicenter.The parameters of nodal plane I obtained by inversion are: strike 79°, dip 79°, slip angle-36°; The parameters of nodal plane II are: strike 176.9°, dip 54.8°, slip angle-166.5°; P-axis azimuth 32°, inclination 33 °, T-axis azimuth 133°, inclination 16°; Moment magnitude MW 5.2; The focal centroid depth is 11 km which belongs to shallow earthquake. Nodal plane I is the seismogenic fault near EW strike,and is a high dip sinistral oblique slip fault which is slightly different from the eastern part of Nantian mountain; The P-axis of the principal compressive stress axis in this area is NNE-SSW direction, and the dip angle is small. The T-axis of the principal tensile stress axis is NWW-SEE direction, which is almost perpendicular to the azimuth of the P-axis. The stress characteristics are the same as the regional tectonic stress field.

The monitoring and analysis of network public opinion information after the earthquake, as well as the rapid acquisition, processing, analysis and judgment of disaster information are of great significance for relevant departments to carry out earthquake emergency rescue, master disaster relief dynamics and stabilize public sentiment. Based on the Sina Weibo data, this paper obtains Weibo and comments related to Lushan M_S6.1 earthquake and Maerkang M_S6.0 earthquake swarm in Sichuan Province. By fully mining, analyzing and expressing the information, this paper studies the evolution of Weibo public opinion, characteristics of people's emotional response, hot spots of concern, etc. in the earthquake event, and on this basis, classifies and extracts disaster information such as house damage, lifeline engineering damage, casualties, etc, It can provide scientific and technological support for earthquake emergency decision-making.

For the M_S 5.4 earthquake in Kyrgyzstan on December 29, 2022, the medium and short-term anomalies in geophysical observations before the earthquake were sorted out and their temporal and spatial evolution processes were analyzed. The research shows that the number of geophysical fixed-point observation anomalies before the earthquake is small, but there are a certain number of electromagnetic anomalies, which may be related to the size of the earthquake and the strike slip nature of the structure in the source area. There are periodic changes in the number of anomalies before the earthquake, and there is an increase in the number of anomalies. There are three different stages of anomalous temporal and spatial evolution, namely the first stage, where the precursor anomaly in the near source area expands outward; In the second stage, anomalies appeared on a large scale; The third stage showed an abnormal contraction towards the epicenter. Studying the temporal and spatial evolution characteristics of precursor anomalies during the process of earthquake preparation, especially the phenomenon of abnormal contraction or diffusion, has certain guiding significance for predicting dangerous areas and time of earthquakes.

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.