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.

Weizhou Island is located about 37 km south of Beihai City, Guangxi Province. It is the youngest Quaternary volcanic island in China. The island has two volcanic eruptions, Nanwan Volcano and Daling Volcano. The study shows that the two volcanoes have similar eruption processes: the early stage is a phreatomagmatic explosive eruption, the middle stage is a magmatic explosive eruption, and the late stage is a phreatomagmatic explosive eruption. The Nanwan fire has the characteristics of migration, and the last eruption age is the late Late Pleistocene. The eruption time of Daling volcano is later than 33 ka. In this paper, the risk probability map of volcanic ash disaster in Weizhou Island is completed. The results show that the volcanic ash produced by explosive eruption of magma will affect Weizhou Island and its surrounding 30 km range, and has little impact on other areas.

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.

To improve the earthquake monitoring equipment operations and maintenance security system construction, form operations personnel unified command, unified equipment management, unified scheduling, equipment operations efficient equipment support mechanism, improve the earthquake equipment operational response speed and the ability to solve practical problems, this paper is based on the cloud platform, use to server architecture design to realize the seismic equipment operational security system. Starting from the actual operation and maintenance of seismic equipment, the system strives to solve the deficiencies of poor management efficiency and low timeliness of operation and maintenance in the current operation and maintenance work, and realizes the digitization of troubleshooting, equipment management, data archiving and other functions of regional operation and maintenance work, which provides feasible reference for improving and supplementing the construction of regional operation and maintenance support system of seismic instruments and equipment.

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.

Using the RTL algorithm, the seismic activity changes before the Wushi M_S7.1 earthquake were quantitatively analyzed using the earthquake catalogue six years before the earthquake.The effects of different characteristic radius and magnitude lower limit Mmin on the V_RTL curve are analyzed respectively.The results show that the characteristic radius, magnitude lower limit and analysis period have a certain influence on the V_RTL calculation results.However, the abnormal changes of seismic activity enhancement can be detected before the Wushi M_S7.1 earthquake, and the anomalies show the change pattern of ‘rise-turn-fall’.The Wushi M_S7.1 earthquake occurred in the process of turning down after the anomaly reached the peak point.When r₀=60 km and M_min=M_S1.5, the anomaly duration is about 18 months.It provides a certain reference for understanding the seismogenic process and earthquake precursor research of the Wushi M_S7.1 earthquake.

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.

Using 131 destructive seismic events with intensity data, a total of 322 pairs of long and short axis data of intensity circle, the attenuation relationship of seismic intensity in different regions of Xinjiang is fitted by mathematical method. The seismic intensity attenuation models used in Xinjiang region are collected and sorted out. The long and short axis radii of each intensity zone of Wushi M_S7.1 earthquake on January 23,2024 are simulated and calculated by using the model, and the absolute error analysis is carried out with the long and short axis radii of the actual survey intensity. The high intensity area of this earthquake is more than 40% larger than the high intensity area of the same magnitude in the past. The calculation results in the VII degree area are the closest to the actual value. The error in the long axis direction of the VI degree area is small, and the error in the short axis direction of the VI degree area is large. The intensity attenuation relationship used in the past may have a small epicenter distance in the high intensity area, and there is a large epicenter distance in the low intensity area. Therefore, when the intensity attenuation relationship is used to quickly evaluate the intensity impact field of earthquake disasters, special attention should be paid to the method of limiting the head and tail of the attenuation relationship to more accurately evaluate.

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.

Aiming at Wushi M_S7.1 earthquake on January 23,2024, the static Coulomb stress and the loading and unloading effect of the main faults are calculated. Combined with the spatial distribution of the remaining aftershocks, the stress triggering and its influence on the surrounding main faults are analyzed. The results show that: (1) Most of the aftershocks in the epicenter of Wushi M_S7.1 earthquake are densely distributed in the stress enhancement area near the fracture surface, and the aftershocks in the stress unloading area are less distributed. Part of the stress loading area on the fracture surface of the main shock further enhances the risk. (2) The stress loading effect of about 50 km in the Coulomb failure stress loading area is gradually released, and the aftershocks in the source earthquake area are densely distributed within 100～200 km and within a depth of 20 km. (3) According to the loading effect, the west section of Wusun ridge fault, the middle and east section of Kashi river fault, the east section of Keguqin fault, the middle section of Boa fault and the west section of Beiluntai fault are worthy of attention in space.

Before the M6.4 earthquake inYangbi, Yunnan on May 21, 2021, the comprehensive probability values of the comprehensive prediction scheme of the M_S≥5.0 earthquake in western Yunnan and the comprehensive probability values of the comprehensive prediction scheme of the M_S≥6.0 earthquake in Yunnan breaking through the prediction threshold on January 28, 2021 and March 17, 2021 respectively, reaching the medium-term prediction index and meeting the first conditions of the prediction. Mercury and solid carbon dioxide in Xiaguan have also breaking through the forecast threshold, and the necessary conditions have been met. According to the hierarchical early warning model, the comprehensive prediction scheme of M_S≥5.0 earthquake in western Yunnan and the comprehensive prediction scheme of M_S≥6.0 earthquake in Yunnan have the conditions for short-term prediction on January 28, 2021 and March 17, 2021 respectively. Yangbi M_S6.4 earthquake occurred on May 21, 2021 after 3.8 months and 2.1 months respectively.When both comprehensive schemes reach the short-term prediction index, the risk of M_S≥6.0 strong earthquake in western Yunnan is enhanced.

By analyzing the characteristics of underground fluid anomalies and focal mechanism solutions before Changji M_S4.8 earthquake on July 20,2022,the characteristics and distribution range of underground fluid anomalies before the earthquake were summarized.The analysis shows that the underground fluid anomaly of the Changji earthquake is within 80~140 km.From the perspective of the time from the earthquake,the underground fluid anomalies before the Changji earthquake can be divided into short-term anomalies and medium-term trend background anomalies, of which short-term anomalies are the main ones.Background anomaly of the medium-term trend shows that the dynamic water level of Xin 26 Spring decreases first and then increases.The short-term and impending anomalies are manifested as the rise of static water level in Xin 04 Well, the rise of static water level in Xin 20 Well and the rise of conductivity in Xin 15 Spring.The anomaly shows an EW distribution in space.The focal mechanism solution results show that the nodal plane I strikes 81°, the dip angle is 69°, and the slip angle is 174°.The nodal plane II has a strike of 173°, an inclination of 84°, and a sliding angle of 21°.The P-axis orientation is 305°, and the T-axis orientation is 39°, indicating that Changji M_S4.8 earthquake was an earthquake event under the stress of NWW compression and NEE extension.The direction of the main compressive stress obtained from the focal mechanism solution of Changji earthquake is the same as that of anomaly distribution before the earthquake.

Zemuhe fault zone, serving as a common boundary between the Daliangshan sub-block and the Chuan-dian rhombohedral block, connects the active southeastern Tibetan Plateau with the stable Southern China block, and recent research indicates an increasing risk of strong earthquakes along this fault zone. The seismic deformation characteristics and stress distribution state of the southern section of the Zemuhe fault zone are quantitatively analyzed in this paper, utilizing newly established continuous GNSS observation data in the near field along with published regional GNSS observation data since 2017. By obtaining the interseismic motion field, we invert kinematic parameters of faults based on a double fault dislocation model. The results reveal that slip rates of the southern Zemuhe fault zone is 3.57±0.47 mm/yr and of the southern Daliangshan fault zone is 5.05±0.47 mm/yr. The near-field data of the newly constructed Zemuhe fault zone exerts a significant influence on the precision of model estimation, thereby substantially enhancing the resolution of the double-fault dislocation model. The strain rate results show that the principal strain rate direction of the eastern boundary of the Sichuan-Yunnan block is characterized by SW-NE stretching and NW-SE squeezing. The southern section of the Zemuhe fault zone presents a higher stress state, with the tensile strain rate being higher than the compressive strain rate, with the average magnitude of 41 nstrain/yr and 27 nstrain/yr, respectively, and is in the high gradient zone of the maximum shear strain rate, with the average magnitude of 28~40 nstrain/yr, indicating significant stress and energy accumulation.

Post-earthquake early warning system of Wushi M_S7.1 earthquake produced four reports of earthquake early warning information, and pushed the first report of earthquake early warning service to the earthquake area at 12.2 s after the earthquake. By analyzing the output and release of earthquake early warning, it is found that the deviation between the epicenter position of the first report and the official result is the smallest, the deviation between the occurrence time of the second report and the third report and the official result is the smallest, and the deviation between the magnitude of the fourth report and the official result is the smallest. With the increasing number of early warning stations participating in the calculation, the magnitude of early warning is increasing, and the response level of some early warning terminals is increasing. The radius of the blind zone of the earthquake early warning is about 43 km, and the terminal response outside the blind zone is good, which effectively estimates the possible seismic damage of different field points.

Using the mobile gravity observation data after Wushi M_S7.1 earthquake in the South Tianshan area,the gravity field changes in the South Tianshan area before and after Wushi M_S7.1 earthquake were obtained,and the 1-year and multi-year scale gravity changes before and after the earthquake in the area were studied. The results show that after the Wushi earthquake,the zero isoline of gravity change passes through the epicenter area and a high gradient zone of gravity change appears. In the area where the zero contour of gravity change appears,the material density is undergoing a transition process of increasing and decreasing. The difference in material increase and decrease leads to strong movement and energy accumulation. The gravity anomaly before strong earthquakes may last for a long time,and there may be a small change in the gravity field. Therefore,when extracting and analyzing the gravity anomaly signal before strong earthquakes,it is necessary to consider the gravity observation data with a long time span. The mobile gravity data observed after the earthquake can better reflect the stress release characteristics of the seismogenic fault,which is helpful to analyze the development trend of aftershocks.

This paper summarized the seismotectonic background, focal mechanism solutions, seismic sequence characteristics and seismicity anomalies of M_S5.4 Kyrgyzstan earthquake. The results are as follows:① This earthquake occurred in the Keping block, and the seismic structure was the branch fault of the Maidan fault, the Kuokesale fault. ② The focal mechanism solutions is thrust type, which may be an earthquake that occurred after strong extrusion in the Tarim Basin and the Tianshan Mountains. ③ The earthquake sequence type is mainshock-aftershock type, and the sequence aftershocks are not abundant, with a rapid decay in frequency and intensity.④ Five seismic activity anomalies existed before the earthquake, namely, the pre-earthquake anomaly showed a long-term calm of medium earthquakes→increased seismic activity→a significant increase in the frequency of small earthquakes→orderly distribution→weakening of enhancement activity→the occurrence of earthquakes, and the seismic characteristics of medium-term transition to short-term. Spatially, it shows the characteristics of shrinkage from a large area to a small area close to the epicenter area, and the short-term performance of the anomaly before the earthquake is a significant increase in the frequency of medium and small earthquakes.

This paper briefly introduces the geological tectonic background around Wushi M_S7.1 earthquake in 2024, and analyzes the seismic activity status in the Xinjiang region and the characteristics of regional abnormal seismic activity before the M_S7.1 earthquake.The results show that: ① Before this earthquake, the seismic activity had well-matched characteristics of "long-term, medium-term, and short-term" anomalies, manifested as long-term background anomalies of strong earthquakes within 10 to 30 years, medium-term anomalies of moderately strong earthquakes within 1 to 3 years, and medium-short-term anomalies of small and moderate earthquakes about 0.5 years before the event; ② The spatial distribution characteristics of the pre-earthquake anomalies exhibited a pattern of "contraction" toward the earthquake area, manifested as a gradual contraction process from "Xinjiang and adjacent overseas areas" → "Xinjiang region" → "related tectonic areas or the vicinity of the earthquake area"; ③The pre-earthquake anomalous state transitioned from "single-type" to "diverse" with time. The anomalies of strong and moderately strong earthquakes were primarily characterized by "periodicity or quiescence", whereas small and moderate earthquake anomalies included various types such as seismic gaps, seismic belts, earthquake swarms, and frequency increases.

This study utilizes D-InSAR technology to process ascending and descending orbit data from the Sentinel-1 satellite, acquiring the line-of-sight (LOS) co-seismic deformation field of the 2016 Hutubi M_S6.2 earthquake and extracting the two-dimensional surface deformation information of Hutubi earthquake. The results indicate that the co-seismic deformation field from ascending and descending orbits displays more significant surface uplift than conspicuous subsidence deformation features. In addition, in order to further investigate the characteristics and spatial relations of InSAR co-seismic deformation field, the study results are compared with the co-seismic deformation fields of four thrust earthquakes, namely 2015 Pishan M_S6.5 earthquake, 2017 Jinghe M_S6.6 earthquake, 2020 Jiashi M_S6.4 earthquake and 2024 Wushi M_S7.1 earthquake. It is found that there is a specific spatial relationship between InSAR ascending and descending orbit and seismic deformation field. The research results can provide scientific basis for earthquake disaster assessment and earthquake emergency management departments to formulate risk prevention and disaster reduction measures.

Based on the damage of houses collected from 219 survey points in the field work of Wushi M_S7.1 earthquake, the characteristics of building damage in this earthquake are analyzed. The highest intensity of the earthquake area is IX degree, and the area above VI degree involves 6 counties and a corps field; the building types in the disaster area are mainly frame structure, brick-concrete structure and brick-wood structure, and the seismic damage characteristics of different structural types of houses in the disaster area are analyzed, in order to provide reference for the seismic design and construction of urban and rural houses in this area after the disaster.

This paper analyzes the security protection requirements and possible security risks of Xinjiang earthquake early warning information system according to the requirements of the three-level security protection ‘one center, three protection’ of the equal protection 2.0 standard. The design scheme of network security architecture technology frame for early warning information system of Xinjiang Earthquake is proposed. The design scheme meets the needs of equal protection construction and reflects the comprehensive network security defense capability of Xinjiang earthquake early warning information system. In order to ensure the stable operation of Xinjiang earthquake early warning information system and ensure the actual operation of the design scheme, the network security protection efficiency is brought into play. Security policy configuration suggestions are given for different areas such as data access area, early warning core data area, security management area and earthquake early warning information emergency release (DMZ) area.

Observation data of CZB-2A vertical pendulum borehole tiltmeter at Fuyun station from 2015 to 2022 were selected, and the interference factors such as the operation of borehole tiltmeter, observation system, observation environment and human disturbance were analyzed and summarized, especially the rate steering distortion caused by ice and snow melting in spring every year. The change range and rate are proportional to the amount of snow, and the abnormal characteristics of observation data are analyzed. The results show that the tilt rate and tidal factor anomalies before Mongolia M_S5.9 earthquake are obvious, indicating that the Fuyun vertical pendulum borehole tiltmeter has a certain ability to monitor earthquake precursor anomalies.

As an affected area of the 1605 Qiongzhou M712 earthquake, Dongzhai Port's subsidence deformation holds significant importance for studying land subsidence processes and urban planning in Haikou. This study utilizes fiber Bragg grating (FBG) borehole displacement monitoring technology to analyze vertical displacement data from seven boreholes over two years, determining current subsidence rates and investigating influencing factors. Key findings include: (1) Displacement rates at seven boreholes range from -8.40 mm/a to 18.78 mm/a, with average subsidence and uplift rates of -3.10 mm/a and 4.42 mm/a respectively. (2) Deformation exhibits distinct vertical stratification, primarily concentrated in shallow subsurface layers, potentially explaining the limited surface deformation observed. (3) Subsidence rates show positive correlation with stratum bearing capacity, indicating tectonic activity as the dominant control mechanism, while geological processes like sand liquefaction and soft soil creep appear less influential. (4) The tectonic framework reveals differential movement patterns: subsidence within the Dongzhai Port graben contrasts with uplift in adjacent horsts, spatially consistent with structural controls from the Puqian-Qinglan fault system.

To clarify the primary influencing factors in different frequency bands of the strain measurement data from the Jinping seismic station, the Fast Fourier Transform (FFT) method was applied to analyze the spectral characteristics of the NS/EW components of the strain meter and temperature and pressure observation sequences. The results indicate:① significant in-phase features were observed in the annual, daily, semi-diurnal, and high-frequency bands among the three; ② the NS component in the 2⁶～2⁷ min frequency band and the EW component in the 2⁶～2⁸ min frequency band exhibited strong linear correlation with pressure; ③ solid tidal effects were clearly identified in the observation data, validating the stability and reliability of the data; ④ temperature was the dominant factor in the annual frequency band, with phase lags of 77 days for the NS component and 71 days for the EW component. After phase correction, the two components exhibited a significant linear relationship. Additionally, the roles of interference factors and their physical mechanisms at different frequency bands were explored, providing theoretical foundations for preprocessing deformation observation data and interpreting geophysical signals.

Through five different pumping depth experiments at the depth of 5~105 cm at the Aksu fault hydrogen observation point in Xinjiang, it can be seen that there are great differences in the hydrogen background value, daily amplitude and dynamic characteristics of different pumping depths in the fault hydrogen observation.Due to the strong penetrability and low viscosity of hydrogen diffusion, hydrogen has obvious uneven zonality in the vertical direction of the observation hole. And because of the difference in the structural position of the observation point and the influence of meteorological factors, the hydrogen background value and the quality of the observation data are different. The pumping depth of 80 cm in the hanging wall of the fault at Aksu observation point, the mean square error and coefficient of variation of fault hydrogen data are significantly better than other depths, which can be used as the preferred depth of Aksu fault hydrogen observation.

In order to solve the problem of time-consuming and inefficient manual inspection seismic information management system, the article uses Python-based selenium automation test tools, image recognition technology and office automation technology to establish an automatic inspection platform of Xinjiang seismic information management system, which can automatically complete system login, capture and storage of key information, data comparison analysis, and the generation of inspection reports. Compared with manual inspection, automatic inspection can save 70% of the time, with high stability and accuracy, which can effectively improve work efficiency.

In order to study the difference in the magnitude determination of seismic events by downhole and surface seismometers, the new national standard magnitude calculation formula was used to obtain a total of 289 near-earthquakes and 99 teleseismic magnitude differences obtained by surface and downhole seismometers at Kashgar Mageti Seismic Station and Yuepuhu Seismic Station. The results show that the average values of the near-seismic magnitude difference and the far-seismic surface wave magnitude difference at Maigaiti station are 0.264 and 0.023, respectively, and the average value of the near-seismic magnitude difference at Yuepuhu station is 0.476. The near-earthquake magnitude difference between Maigaiti and Yuepuhu stations decreases gradually with the increase of epicentral distance, but shows the opposite characteristics with the magnitude change trend. For the determination of near-earthquake magnitude, the magnitude measured by surface seismometer is larger than that measured by underground seismometer, and the magnitude measured by underground seismometer is closer to the magnitude of seismic events. For teleseism, the magnitude measured by surface seismometer is not much different from that measured by underground seismometer.

After Wushi M_S7.1 earthquake on January 23, 2024, the aftershock sequences 30 days after the earthquake were automatically detected using the RISP system, and the results of the automatic detection were compared and analyzed with the results of manual cataloging. The results show that 19432 earthquakes were automatically detected by the RISP system, and 4 887 earthquakes were matched with the manual catalog, of which the matching rate of M_L≥5.0 was 100%, the matching rate of M_L4.0～4.9 was 88.37%, the matching rate of M_L3.0～3.9 was 82.48%, the matching rate of M_L2.0～2.9 was 80.38%, and the matching rate of M_L≤2.0 was 74.85%. The large difference in epicenter was the main factor affecting the matching rate. For earthquake events that have been successfully matched, the time difference between the automatic and manual catalogs is mostly between -4 and 0 seconds, with a deviation of -1.33±1.03 seconds, an epicenter deviation of 10.15±6.47 km, and a depth deviation of 6.99±12.27 km; The magnitude deviation is -0.18±0.24. The system produces results quickly and has significant advantages in small earthquakes. The automatic aftershock results generated by earthquakes with M_L≥3.0 are basically in line with the expected purpose.

Since 2016, there have been 6 earthquakes above M_S5.0 in the middle Tianshan region of Xinjiang, including the Hutubi M_S6.2 earthquake and the Jinghe County earthquake of magnitude 6.6. The seismic activity is relatively frequent and the stress field changes obviously.In this paper, the data of epicenter distance 85°~130°, M_S≥5.5 and clear SKS or SKKS seismic phase recorded by 22 broadband seismic stations in Xinjiang Digital Seismic Network from 2016 to 2020 are used. In this paper, the minimum eigenvalue method (EV), rotation correlation method (RC) and minimum tangential energy method (SC) are used to calculate the anisotropy parameters below the station, that is, the polarization direction of fast wave (φ) and the delay time of slow wave (δt).The results show that the thickness of the upper mantle in the middle Tianshan Mountains is 70~115 km. The direction of upper mantle anisotropy is mainly NE and NW, and the results show that there is a complex anisotropic structure in the lower medium in the middle Tianshan region of Xinjiang. By comparing the anisotropy direction of the upper mantle and the direction of plate movement, it is found that the mantle flow model in the region is a simple asthenosphere flow.

Using the continuous gravity data observation data of Xinjiang Wushi station, analyze the change of power spectral density with time, calculate the vertical displacement of the double frequency microseisms, and combine with the Ardhuin seismic spectra model(ASSM) to explore the influencing factors that may affect the double frequency microseism, The results show that the anomalous change of the double frequency microseism before the Jiashi M_S6.4 earthquake is not affected by the typhoon, waves and meteorological factors, and it may be a pre-seismic perturbation of the earthquake. The study of the double frequency microseism characteristics will have implications for earthquake forecasting.

In view of the rapid 'up-down' abnormal change of the observation data curve of the water level of Xin32 well in Xinjiang Bole from 2019 to 2020, the porosity of the aquifer medium of Xin32 well under undrained condition is obtained by calculating the parameters such as air pressure coefficient and tidal factor based on the observation data of water level and atmospheric pressure of the observation well. By studying the variation characteristics of the porosity value of the well-aquifer system of the new 32 well under different conditions, the hydrodynamic reasons for the abnormal change of the water level observation data curve are analyzed. The results show that the abnormal change of water level observation data in Xin 32 well is less correlated with stress change, which is related to the increase of recharge caused by the change of aquifer medium.

Analyze the coulomb stress variation and cumulative magnitude and its effects on the main faults by using the source parameter data of two strong earthquakes and the attribute characteristic value of the main faults in this region, based on the viscoelastic medium model. The analysis results show that: (1) The cumulative change of coulomb stress of the two strong earthquakes is mainly concentrated in the Kashi-Wuqia intersection area and Keping block. (2) The activities of the two strong earthquakes have increased stress effects on the faults of Kazkeaerte, Kembet, Aoyitake and Maidan. Then we should pay more attention to these areas.

After Wushi M_S7.1 earthquake, five emergency mobile seismic stations were set up near the epicenter to monitor the aftershock activity in the epicenter area with the surrounding seismic monitoring stations. The establishment, data transmission, data recording and aftershock recording of the mobile seismic station in this earthquake site are introduced. It shows that the mobile seismic station plays an important role in aftershock monitoring. The noise level of the mobile seismic station base is calculated, and it is confirmed that the erection environment of the mobile seismic station basically meets the erection requirements. This paper summarizes the experience of setting up the mobile seismic station, and provides suggestions for carrying out the mobile seismic observation work.

When we are committed to studying the current crustal movement, seismic topographic deformation and earthquake prediction, various effects from the outside of the earth are often regarded as interference in general, which should be eliminated through data processing. In order to improve the application efficiency of geophysical field observation data and enhance the reliability of seismic anomaly extraction, this paper decomposes Geermu earth tilt, air temperature and air pressure into daily wave, semi daily wave, monthly wave and annual wave, and quantitatively studies the interference factors of earth tilt in different frequency bands. The results show that ① Germu earth tilt has good consistency in the frequency bands of diurnal wave and semidiurnal wave, and the main influencing factor is solid tide;② After phase shift, the annual wave band of earth tilt has a high linear correlation with air temperature, indicating that the annual periodic change of Geermu earth tilt is greatly affected by temperature.

Aiming at Wushi M_S7.1 earthquake on January 23,2024, the anomalies of underground fluid exchange data in Kazakhstan before the earthquake were sorted out and the temporal and spatial variation process was analyzed. The results show that there are five anomalies in the underground fluid exchange data of Kazakhstan before the Wushi earthquake, of which three are short-term anomalies, all of which appear three months before the earthquake. The anomaly is mainly located in the range of 200~500 km from the epicenter. The number of anomalies before the earthquake gradually increased, and the spatial and temporal changes of anomalies showed outward expansion and then contraction to the epicenter. Most of the anomalies before the earthquake are positive anomalies, and the research results are helpful to improve the understanding level of underground fluid precursor anomalies.

In order to accurately obtain the effect of the Xinjiang Qinghai-Tibet Plateau monitoring capacity improvement project on the actual improvement of monitoring capabilities in the southern region of the Xinjiang seismic network (Central Kunlun-Aerjin-Luobupo), this study used the "probability-based completeness magnitude" PMC method , calculate the official observation reports of the Xinjiang seismic network before and after the project is completed, and obtain the detection probability and minimum integrity magnitude M_P of the seismic stations in the study area. Through analysis, the following conclusions are drawn: the detection probability of a single station can truly represent the station's detection ability of earthquake events, and there is a significant difference; M_P shows that the Qinghai-Tibet Plateau Monitoring Capacity Improvement Project has significantly improved the regional earthquake monitoring capabilities in southern Xinjiang. The overall average improvement in the region is about 0.5 to 1 level, but there are regional imbalances. The research results can provide some reference for further improving the earthquake monitoring capabilities in southern Xinjiang, optimizing the spatial layout of the network, and improving the operation quality of the stations.

Based on the analysis of the multi-year observation data of gas radon in Xin 37 spring of Fuyun Wuqiagou, it is found that the changes of temperature, pressure and water level have a significant impact on the quality of gas radon observation, which leads to the interference of radon content data. In order to solve these problems, the fixed discharge valve was replaced at the outlet of the observation pool, which stabilized the water flow and ensured the accuracy of radon value observation. At the same time, the gas path of the floating degassing-gas gathering device was reformed, and the casing floating mode was adopted to effectively avoid the problem of condensate blockage caused by temperature and pressure changes. After the transformation, the observation system forms a sealed environment, the degassing efficiency is improved, and the gas collection is more stable.

In order to analyze the source of two geomagnetic daily ratio anomalies in the western part of the southern Tianshan Mountains in Xinjiang on December 10,2021 and November 27,2023, the current location of the two geomagnetic daily ratio anomalies was carried out, and its spatial relationship with the subsequent corresponding earthquakes was analyzed. The results show that:(1) There is no significant difference in the area enclosed by the threshold line and the current line between the two geomagnetic daily ratios. The three earthquakes are located at the end of the abnormal current line, and the distance between the earthquake and the current line is significantly smaller than the threshold line. (2) There is a significant negative correlation between the distance between the station and the abnormal current line and the geomagnetic daily ratio. (3) The ratio of the daily ratio of the station pairs corresponding to the current line endpoints with earthquakes is larger than that of the corresponding endpoints without earthquakes, that is, earthquakes may be more likely to occur between station pairs with large differences in daily ratios.

Based on high-quality teleseismic waveform data recorded over seven years at the Kashi Seismic Station (KAS station), located within a sedimentary layer, high-frequency and low-frequency receiver functions were extracted respectively. The receiver function H-К stacking method without considering sedimentary layer effects and the receiver function sequential H-К stacking method considering sedimentary layer effects were applied to determine the depth of the second intracrustal interface, velocity ratio, and crustal thickness beneath the KAS station. The results incorporating the sedimentary layer influence align with the crustal thickness and crustal velocity ratio values beneath the bedrock Kashi-zhongji Seismic Station (KSZ station), located 8.4 km away. The depth of the second intracrustal interface beneath the KAS station is 13.5 km, with a velocity ratio of 1.96 (Poisson's ratio of 0.324). The crustal thickness is 57.7 km, with a velocity ratio of 1.86 (Poisson's ratio of 0.297). Comparative analysis reveals that applying the receiver function H-К stacking method to seismic stations with significant sedimentary layers can lead to significant deviations in the analysis of intracrustal interface depths and medium velocity ratios. In contrast, the receiver function sequential H-К stacking method yields accurate results. This finding provides valuable practical experience and a methodological basis for accurately analyzing the depths of intracrustal interfaces and medium velocity ratios at other stations situated within sedimentary layers.

Using the seismic phase observation report of Xinjiang Seismic Network, the double-difference positioning method was used to accurately locate and analyze 555 seismic events of the earthquake swarm from April 2017 to August 2024, and finally 520 high-precision positioning results were obtained. The P-wave first motion method is used to invert the focal mechanism solution of M_L≥2.0 earthquakes. Combined with the regional seismic tectonic background, it is found that the earthquake swarm is elliptically distributed on the surface projection, oblique to the Kewu fault, and the long axis is NW-SE. The depth distribution is mainly concentrated in the range of 9～13 km. The dominant strikes of the two sets of conjugate nodal planes of the focal mechanism solution are NW and NE, and most of the earthquakes in the swarm are mainly strike-slip. According to the precise location of the earthquake swarm, the results of the focal mechanism solution and the regional geological structure characteristics of the study area, it is considered that the Kewu fault, which is dominated by reverse fault slip, is not the seismogenic fault of the earthquake swarm. Affected by the compressive and torsional deformation of the Indosinian and Yanshan periods, the Kewu fault earthquake swarm develops multiple secondary faults. The earthquake swarm may be controlled by the NW and NE strike-slip secondary faults. These secondary faults are developed in the front edge of the Kewu fault and obliquely intersect with the Kewu fault, which may have the characteristics of small scale and high density, so that the earthquake swarm is distributed in a plane shape.

Kuqa-Shaya area is located in the northern margin of Tarim Basin and belongs to the oil and gas production concentration area. In recent years, the seismic activity in this area has shown a significant increase trend, while the earthquake monitoring capability of the Xinjiang Seismic Network in this region is relatively weak. This article uses Sentinel-1A orbit data from the Kuqa- Shaya region from 2020 to 2022 for time series analysis, and combines GNSS velocity field correction to obtain high-precision and high-resolution inter seismic deformation fields in the entire study area. It further explores the spatial relationship between the distribution of small and moderate earthquakes and deformation fields, and obtains the following understanding: (1) The surface deformation characteristics of the entire Kuqa-Shaya region are mainly subsidence, with an average rate of -2.5 mm·a^-1, and the subsidence rate in some agricultural activity areas reaches -30 mm·a^-1. (2) The Kuqa-Shaya earthquake cluster is not located in a concentrated subsidence area. In 2024, three earthquakes of magnitude 5 occurred in the Yuke gas field area with a subsidence rate of -2.5 mm·a^-1. The changes in the deformation field in this area may be related to oil and gas extraction. From the perspective of deformation, this paper proposes a surface deformation monitoring method suitable for the platform basin area of the Tarim Basin, which improves the seismic monitoring capability of the Xinjiang Seismic Network in the Kuqa-Shaya area.