15 December 2025, Volume 39 Issue 4

    

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  STUDY ON PRE-EARTHQUAKE ANOMALIES AND PREDICTION SIGNIFICANCE OF MAGNITUDE 5 EARTHQUAKE SWARM IN YULI-KUCHE, XINJIANG

  MA Qian-wen, SONG Chun-yan, NIE Xiao-hong, GUO Yin, LIU Ping

  Inland Earthquake. 2025, 39(4): 311-320. https://doi.org/10.16256/j.issn.1001-8956.2025.04.001

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  Based on the analysis of the earthquake swarm sequence, the seismic activity anomalies related to the two earthquake swarms are summarized, and the influence of the 5-magnitude earthquake swarm on the seismic trend in Xinjiang is analyzed. The results show that the earthquake sequence in Yuli-Kuche area in 2024 belongs to the earthquake swarm type, including two earthquake swarms with magnitude greater than 5.0. The whole sequence activity shows an increasing trend and is still in a state of continuous activity. There are six anomalies related to two earthquake swarms with M≥5.0, which are the frequency of earthquakes with M≥3.0 in the middle section of Tianshan Mountains, the high frequency of earthquakes with M≥3.0 in the middle section of Tianshan Mountains, the high frequency of earthquakes with M≥3.0 in Kuche-Shaya area, the 4.5 earthquake window near Baicheng, the significant activity of earthquake swarms near Baicheng, and the stress drop in Kuqa earthquake area.
  
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  RESEARCH ON IDENTIFICATION AND PREVENTION OF GEOLOGICAL DISASTER HIDDEN DANGERS BASED ON UAV OBLIQUE PHOTOGRAMMETRY

  FAN Li-li, FAN Bin-bin, LI Gui-rong, WEN Ying, REN Long

  Inland Earthquake. 2025, 39(4): 321-328. https://doi.org/10.16256/j.issn.1001-8956.2025.04.002

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  To address the geological hazard issues in the quartz diorite mining area of Yutian County, Xinjiang, this study proposes a risk assessment method integrating unmanned aerial vehicle (UAV) oblique photography and multi-source data coupling analysis. Based on the SWDC-5 five-lens oblique photography system, a high-precision 3D realistic model was constructed. Multi-source data, including topographic parameters (elevation zoning, slope gradient, slope aspect differentiation), hydrological geomorphology (river lateral erosion, gully headward erosion), and human activity disturbances (road and house construction), were integrated to establish a "topographic parameters-hydrological geomorphology-human activity disturbances" multi-source driven evaluation model. The results show that: ① The intersection areas of SE-facing steep slopes (slope>35°) and NW-SE structural zones are high-risk areas for disasters, and the model-predicted core risk zones for geological hazards have fully covered historical disaster points; ② Five core risk zones were delineated, and a hierarchical prevention and control strategy was proposed, including anchoring engineering, ecological slope protection, and residential relocation, which can effectively reduce the disaster occurrence rate.
  
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  DESIGN AND IMPLEMENTATION OF EARTHQUAKE ALERT SITE MONITORING SOFTWARE

  LI Kui, ZHANG Qing-yuan, ZHAO Xiao-cheng, LIU Li-xia, ZHOU Jing

  Inland Earthquake. 2025, 39(4): 329-336. https://doi.org/10.16256/j.issn.1001-8956.2025.04.003

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  In response to the high incidence of faults in the power supply and communication systems at earthquake early warning stations, an integrated monitoring software has been designed. This software achieves information integration for intelligent power supplies from different manufacturers, rapid data analysis, swift fault diagnosis, advance warnings for power supply faults, and precise information dissemination. The software consists of four main components: information collection, information analysis, information display, and information transmission. Information collection is primarily used to gather power supply data and network communication status from early warning stations; information analysis is focused on extracting analysis of abnormal information; information display is used to visualize power supply data and alert notifications for abnormal information; and information transmission is aimed at sending abnormal information to mobile devices. This monitoring software effectively addresses the challenges faced by early warning duty personnel, significantly reducing the pressure of monitoring duties. It has been applied at the Urumqi Seismic Monitoring Center Station, where it has shortened the fault response time and improved the efficiency of fault handling by the early warning duty staff, demonstrating high practicality.
  
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  CORRELATION ANALYSIS BETWEEN SEISMIC ACTIVITY AND GEOLOGICAL FACTORS BASED ON GREY RELATIONAL METHOD

  FAN Wen-long, Sulitan Yusan, LI Gui-rong, GUI Rong, Adila Wumaier, Hairensha Silamu, LI Dong

  Inland Earthquake. 2025, 39(4): 337-345. https://doi.org/10.16256/j.issn.1001-8956.2025.04.004

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  In order to find out the influence degree of different geological factors on seismic activity in Pamir area of the western section of southern Tianshan Mountains in Xinjiang, three influencing factors of plate movement, fault and rock properties were selected, and the contribution degree of different influencing factors to seismic activity was analyzed by grey correlation method. Taking the seismic activity of the three tectonic units as the reference sequence, and the plate movement, fault and rock properties as the comparison sequence, the grey correlation mathematical model is established. The resolution coefficients are set to 0.1,0.3 and 0.5 respectively, and the correlation coefficient and correlation degree between the reference sequence and the comparison sequence of different tectonic units are solved. The results show that the average correlation degree between plate movement, fault and rock properties and seismic activity is 0.682, 0.646 and 0.510, respectively. There is a high correlation between plate movement and seismic activity, which is the main geological factor controlling seismic activity in the region.
  
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  CONSTRUCTION OF GENERAL STATIONS IN THE YUNNAN SUB-PROJECT OF THE NATIONAL EARTHQUAKE INTENSITY RAPID REPORTING AND EARLY WARNING PROJECT

  SHI Tian-hong, CHEN Yang, LI Deng-yang

  Inland Earthquake. 2025, 39(4): 346-352. https://doi.org/10.16256/j.issn.1001-8956.2025.04.005

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  This paper primarily provides an overview of the construction content of the Yunnan sub - project of the National Earthquake Intensity Rapid Reporting and Early Warning Project. It introduces the construction of general stations, and when exploring the construction quality of general stations, conducts an analysis from multiple aspects such as equipment installation, station inspection, operation rate improvement, and background noise analysis. Through analysis, it is found that during the construction of general stations, there are issues such as non-standard installation and uneven quality of base station buildings, which negatively impact the construction quality. In terms of the operation rate, problems such as shortages of intensity meters and FSU standby equipment and spare parts, overly high operation rate standards, and a single background noise testing method are encountered. Meanwhile, by comparatively analyzing the construction achievements of general stations, basic stations, and benchmark stations in the early warning system, the advantages and disadvantages of the early warning system are further understood. Finally, by discussing aspects such as improving the communication mechanism, protecting the observation environment, increasing standby equipment and spare parts, optimizing the operation rate standard and background noise testing environment, and enhancing the magnitude estimation ability of the early warning system, this paper summarizes the solutions to problems related to the construction of general stations in the earthquake early warning system in Yunnan region, as well as methods to improve the overall effectiveness of the early warning system.
  
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  RESEARCH ON RISK ANALYSIS AND COUNTERMEASURES OF EARTHQUAKE HAZARDS IN KARAMAY

  LIU Xuan-rui, SHENG Yan, ZHANG Jin-yan, LI Bo, LI Jin-xiang

  Inland Earthquake. 2025, 39(4): 353-358. https://doi.org/10.16256/j.issn.1001-8956.2025.04.006

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  Based on the analysis of the basic situation of Karamay, according to the seismic geological data, seismic zoning and active fault detection results, historical seismic monitoring data, the characteristics of seismic activity and seismic structure are analyzed and studied, the risk of seismic disaster in Karamay is evaluated, the weak links of earthquake response in Karamay are analyzed, and the preventive measures are put forward for the key hidden dangers in the region.
  
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  STUDY ON TECHNIQUE AND METHOD OF FAULT RADON OBSERVATION

  YAN Wei, LI Xin-yong, ZHANG Wei

  Inland Earthquake. 2025, 39(4): 359-368. https://doi.org/10.16256/j.issn.1001-8956.2025.04.007

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  Taking Ganhezi fault soil gas observation station as an example, the morphology characteristics of gas components across the fault are measured, and the observation experiment analysis of influence of the thickness of the covering layer, the gas flow rate, the volume of the gas collection, the air temperature and the atmospheric pressure on the air radon is quantitatively out. The results show that the hanging wall of the reverse fault near the fault surface is an ideal location for fault gas observation, and the concentration of fault gas radon tends to be stable after the observation depth is more than 1.5 m. The gas flow rate should be controlled at 0.5 L·min^-1; the smaller the gas collection volume, the higher the gas flow rate, the higher the atmospheric radon concentration, the lower the influence of temperature and pressure on the data, and the more stable the data. Through quantitative analysis of the influencing factors of fault soil gas radon concentration, it provides a reference for the optimization and transformation of some observation stations in the future.
  
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  CHARACTERIZATION OF MANUAL BLASTING RECORDS IN THE HAMI REGION

  ZHANG Lu, RAN Hui-min, Mina Alihabieke, Tayier Kahaer

  Inland Earthquake. 2025, 39(4): 369-379. https://doi.org/10.16256/j.issn.1001-8956.2025.04.008

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  Taking the artificial blasting and natural earthquakes recorded at three seismic stations in Hami area as research objects, the main features of these two types of events are summarized by using the three elements of earthquakes, waveform recording, amplitude ratio and spectrum analysis. The results show that the occurrence time, epicenter location, magnitude, and S-P wave arrival time difference of the artificial blasting are relatively fixed, and there are basic features such as vertical P wave initial motion upward, large P wave amplitude, short-period Rayleigh surface wave development, and large period. The P_m/S_m value of artificial blasting is more than 0.75, and the correct identification rate is 94.47%; the P_m/S_m value of natural earthquake is less than 0.75, and the correct identification rate is 98%. The low-frequency component of artificial blasting is more, and the dominant component is mainly distributed in the range of 0-15 Hz, with fast attenuation; the high-frequency component of natural earthquakes is dominated by high-frequency components, with a wide range of dominant frequencies (mainly distributed in the range of 0-35 Hz), and the energy attenuation is slow.The S-transform shows that the main energy of the artificial blasting is concentrated in the low-frequency portion and is relatively single, whereas the natural earthquakes are rich in high-frequency energy with a more discrete distribution, which is “multi-peak” in nature.
  
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  INFLUENCE OF METEOROLOGICAL FACTORS ON WIDEBAND TILT IN KORLA HUOLA MOUNTAIN AND ITS SEISMIC EFFECTIVENESS TEST

  Mulatijiang Abulaiti, JIA Yong-bin, MAO Yu-jian, GAO Ge

  Inland Earthquake. 2025, 39(4): 380-389. https://doi.org/10.16256/j.issn.1001-8956.2025.04.009

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  This study employs wavelet analysis, correlation analysis, and regression analysis to quantitatively investigate the impact features and mechanisms of temperature, atmospheric pressure, and rainfall on the tilt of KurkureH2 mountain broad-band. Further, a regression analysis is conducted to remove the influence of temperature on the NS component through regression, and the R-value rating method is used for earthquake capability testing, followed by a summary of their anomalous characteristics. The results indicate that:① atemperature and rainfall are the main influencing factors of annual variation. There is a significant linear negative correlation between temperature and NS component. When the phase of NS component (detrended) lags behind temperature for 17 days, the correlation coefficient between the two is up to -0.751;③ the broad-band tilt is influenced by rainfall from April to September each year, with the two components showing an “M” type of yearly change, during which the rainfall during this period suppressed the linear characteristics of the broad-band tilt influenced by temperature;④ the results of R-value test show that the best forecast window for the NS component is 350 days, with optimal R=0.64, R₀=0.71.
  
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  CHARACTERISTICS ANALYSIS ON CO-SEISMIC RESPONSE OF WATER LEVEL IN WELL 41, SICHUAN

  ZHANG Ying, CHEN Meng-die, HE Si-yuan, LIU Hua-jiao, LIANG Hui, KONG Ling-zhe, TANG Yue-yang

  Inland Earthquake. 2025, 39(4): 390-398. https://doi.org/10.16256/j.issn.1001-8956.2025.04.010

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  To explore the coseismic response capacity of the water level in Well Chuan-41 to near-field and far-field earthquakes, this study selected near-field earthquakes with a surface wave magnitude M_S≥6.0 and global earthquakes with an M_S≥6.5 as research objects during the period of 2017-2023. It systematically analyzed the coseismic response characteristics of the water level in Well Chuan-41, and comprehensively evaluated the seismic response capacity of the well from three core dimensions: seismic energy density, relationship between coseismic response amplitude and earthquake magnitude as well as well-earthquake distance, and changes in tidal parameters.The results show that: Well Chuan-41 exhibits good coseismic response capacity to far-field earthquakes with M_S≥7.5, while its coseismic response capacity to near-field earthquakes with M_S<6.0 is relatively weak; the main type of coseismic response of the well's water level is oscillatory change. The specific laws are as follows:The energy density threshold required for far-field earthquakes to trigger the coseismic response of this well is approximately 10^-6 J·m^-3.The surface wave period of small and moderate-magnitude near-field earthquakes is significantly different from the natural vibration period of Well Chuan-41, resulting in the failure to effectively record its coseismic response. The dynamic stress changes caused by large-magnitude near-field earthquakes may lead to changes in the permeability of the aquifer associated with Well Chuan-41.
  
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  COMPARATIVE ANALYSIS OF OBSERVATION DATA OF GS-15 AND GPHONE GRAVIMETER IN THE SAME ADDRESS OF KORLA STATION

  YANG Shao-fu

  Inland Earthquake. 2025, 39(4): 399-406. https://doi.org/10.16256/j.issn.1001-8956.2025.04.011

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  The observation data of two different types of gravimeters in the same observation cave are compared and analyzed from the aspects of observation data quality, background noise level, recording earthquake ability and co-seismic response characteristics. The results show that : GS-15 gravity data has better availability and continuity, while gPhone gravity observation accuracy and background noise level are better ; the GS-15 gravity record has more advantages in the number of strong earthquakes, the duration of earthquakes, and the duration of co-seismic response, while the gPhone gravity record has earlier initial motion time and co-seismic response. The initial motion time and duration of the recorded earthquake and coseismic response are related to the filter constant and damping coefficient of the instrument, and the initial motion direction of the response pattern is related to the azimuth of the station and the epicenter.
  
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  INCLINATION OBSERVATION DATA OF NO.2 BOREHOLEIN KARAMAY HOUSHAN

  BI Hui-juan, Shaletanati Suoertanbieke, ZHOU Bin, LI Jiao

  Inland Earthquake. 2025, 39(4): 407-412. https://doi.org/10.16256/j.issn.1001-8956.2025.04.012

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  After analyzing the reliability of the tilt observation data of No.2 borehole in the back mountain of Karamay, it is confirmed that the tidal factor is basically stable. By eliminating the interference factors such as human influence, instrument failure and weather change, the credibility of anomaly identification before earthquakes is improved, and the typical interference and anomaly characteristics before earthquakes are classified and quantitatively analyzed. The determination and test of the optimal threshold by R value score show that the missing rate of inclination anomaly of No.2 borehole in Houshan, Karamay is low.
  
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  TYPICAL INTERFERENCE ANALYSIS OF GEOPHYSICAL OBSERVATIONS AT XIAGUAN CENTRAL STATION

  ZI Cheng-zhu, HEI He-tang, BI Shu-wei, CHA Wen-jian, ZHANG Yuan

  Inland Earthquake. 2025, 39(4): 413-420. https://doi.org/10.16256/j.issn.1001-8956.2025.04.013

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  Based on the observation data of the geophysical observation of the Xiaguan central station in the past ten years since 2014, the classification and in-depth analysis are carried out to identify the main sources of interference of each measurement item, and the data variation characteristics and identification methods of various typical disturbances are summarized. This provides a detailed reference and reliable basis for the processing and application of geophysical observation data analytics in the jurisdiction.