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Source Mechanism of the M_S 6.6 Xinyuan-Hejing earthquake of June 30,2012

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earthquake Research in China 2015年第2期29卷 247-257页

作者： Ran Huimin Zhang Zhibin Zhao Qing earthquake administration of xinjiang Uygur autonomous region

In this article,we use the CAP method to invert the focal mechanism of Xinyuan-Hejing M S6. 6 earthquake on June 30,2012. Our result shows that the best double couple solution of the M S6. 6 event is 299°,68° and 164° for strike,dip and rake angles respectively. The other nodal plane is 35°,75° and 23°. The azimuth and dip angle of the P-axis are 166°and 5°,those of the T-axis are 258° and 26°. The moment magnitude is 6. 3. The estimated focal depth is about 21 km. The predominant rupture direction of this seismic sequence is NWW. The dip angles are between 60° and 90°. The rake angles are in the majority of ± 180°± 30°. The predominant strike of the azimuthal angle of the P-axis is near NS and T-axis is near EW. Preliminary analysis indicates that nodal plane I is the seismogenic fault,which is a NWW-trending,nearly upright left-lateral strike-slip *** displacement property,the principal compressive stress of this M S6. 6 earthquake and the P-axis preponderant orientation of this seismic sequence agree with the characteristics of the tectonic stress field of the focal area and its surroundings.

关键词： The Xinyuan-Hejing earthquake Cut and paste (CAP) method Sourcemechanim

A hybrid inversion method of damped least squares with simulated annealing used for Rayleigh wave dispersion curve inversion

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earthquake Engineering and Engineering Vibration 2014年第1期13卷 13-21页

作者： Lu Jianqi Li Shanyou Li Wei Tang Lihua Key Laboratory of earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake Administration Heilongjiang Provincial Water Conservancy Hydro Electric InvestigationDesign&Research Institute earthquake administration of xinjiang Uyghur autonomous region

Surface wave methods are becoming increasingly popular in many geotechnical applications and in earthquake seismology due to their noninvasive *** surface wave dispersion curves are a crucial step in most surface wave *** inversion methods have been applied to surface wave dispersion curve inversion,including linearized inversion and nonlinearized inversion *** this study,a hybrid inversion method of Damped Least Squares(DLS) with Very Fast Simulated Annealing(VFSA) is developed for multi-mode Rayleigh wave dispersion curve *** synthetic and in situ fi eld data were used to verify the validity of the proposed *** results show that the proposed method is superior to the conventional VFSA method in aiming at global minimum,especially when parameter searching space is adjacent to real values of the *** advantage of the new method is that it retains both the merits of VFSA for global search and DLS for local *** high temperatures,the global search dominates the runs,while at a low temperatures,the local search dominates the ***,at low temperatures,the proposed method can almost directly approach the actual model.

关键词： damped least squares simulated annealing hybrid inversion dispersion curve Rayleigh wave

A Statistical Analysis on Recent Tidal Triggering of the earthquake in the Tianshan Seismic Zone

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earthquake Research in China 2015年第2期29卷 203-213页

作者： Li Jin Jiang Haikun Qu Junhao Huang Yu Gao Chaojun earthquake administration of xinjiang Uygur autonomous region China earthquake Networks Center earthquake administration of Shandong Province Kashi Standard Seismic Station Earthquake Administration of Xinjiang Uygur Autonomous Region

A statistical analysis is done to study the spatio-temporai features of earthquake activity in the Tianshan seismic belt triggered by tide, based on Schuster＇s test. The data we choose is the ML ≥2. 0 earthquakes from January 1, 2010 to August 31, 2012 in eastern Tianshan, and the calculation is on tidal body stress. The results show that the p-value based on the time window smoothing of Schuster＇s test corresponds better with the strong earthquakes in the Tianshan seismic belt, especially for a long time before the November 1, 2011 Nilka Ms6. 0 earthquake, when the p-value of the Schuster＇s test was always lower than the threshold of 0. 05 for tidal trigger of earthquake, but after the Niika Ms6. 0 earthquake, that value was quickly restored to a high level, which reflects a close relationship between the Nilka Ms6. 0 earthquake and the Earth tide. According to the p-value based on the spatial window smoothing of Schuster＇s test, the Nilka Ms6. 0 earthquake was at or near the tidal triggering area. Thus we can see from the spatio-temporal results that the Nilka Ms6. 0 earthquake was obviously triggered by Earth fide.

关键词： Tianshan seismic zone Nilka earthquake Tidal triggering Schuster's test

Analysis of the Wave Velocity Ratio Anomalies in the Tianshan region of xinjiang

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earthquake Research in China 2017年第1期31卷 39-50页

作者： Zhang Linlin Gao Chaojun earthquake administration of xinjiang Uygur autonomous region Urumqi 830011 China Barkol Seismic Station Earthquake Administration of Xinjiang Uygur Autonomous Region Hami 839200 Xinjiang China

Based on the seismic observation report data provided by the xinjiang Digital Seismic Network from 2009 to 2014,we calculate the wave velocity ratio and its background value for medium and small earthquakes by using the multi-station method in Tianshan,*** paper analyzes the variation of the wave velocity ratio disturbance value to highlight the abnormal,and also back-traces 7 moderate earthquakes at the research *** results show that:(1)the background value of the wave velocity ratio is almost 1.70,the wave velocity ratio obviously decreases in the middle-eastern part of Tianshan and the region near the Puchang fault;(2)the wave velocity ratio disturbance value is mostly low in the epicenter before four earthquakes of M≥5.0 from 2011 to 2013 in the study area;(3)before 7 moderate strong earthquakes,the earthquake events with low value of the wave velocity ratio account for over 60% of corresponding total events near the epicenters,and the low value of the wave velocity ratio is relatively obvious before moderate earthquakes.

关键词： Seismic observation report Multi-station method The wave velocity ratio disturbance value Tianshan region

Features of seismicity in xinjiang and its possible reason after the Yutian M_S7.4 earthquake,2008

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earthquake Science 2009年第6期22卷 615-622页

作者： Qiong Wang Haitao Wang Aiguo Xia earthquake administration of xinjiang Uygur autonomous region Urumqi 830011 China Lanzhou Base of Institute of earthquake Science China Earthquake Administration Lanzhou 730000 China

The paper discusses quantitatively the influence of the Yutian Ms7.4 earthquake of March 21, 2008 and Wuqia Ms6.9 earthquake of October 5, 2008 on regional seismicity in xinjiang, and explains primarily the possible reason of earthquake activity feature in xinjiang after the Yutian Ms7.4 earthquake by analyzing the static Coulomb failure stress change produced by the Yutian Ms7.4 earthquake and Wuqia Ms6.9 earth-quake, and the seismicity feature of Ms≥3 earthquakes in the positive Coulomb stress change region of Kashi-Wuqia joint region, the central segment of Tianshan Mountain and Kalpin block. The result shows that the Yutian Ms7.4 earthquake of March 21, 2008, may encourage the Wuqia Ms6.9 earth-quake of October 5, 2008, and the Yutian Ms7.4 earthquake and Wuqia Ms6.9 earthquake may change the seismicity state in the central segment of Tianshan Mountain, Kalpin block and Kashi-Wuqia joint region, and encourage the subsequent Ms≥3 earthquakes.

关键词： static Coulomb failure stress change earthquake activity feature Yutian Ms7.4 earthquake Wuqia Ms6.9 earthquake

Comprehensive precursor anomaly research based on earthquake corresponding relevancy spectrum

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earthquake Science 2009年第6期22卷 675-681页

作者： Haitao Wang Qiong Wang Lanlan Tang Lanzhou Base of lnstitute of earthquake Science China Earthquake Administration Lanzhou 730000 China earthquake administration of xinjiang Uygur autonomous region Urumqi 830011 China

With the aim to the quantification of anomaly identification and extraction for observed or analyzed records, we present two statistical methods of earthquake corresponding relevancy spectrum （ECRS） and sliding mean relevancy （SMR）. With ECRS method, we can obtain the abnormal confidence attribute of data in different value ranges. Based on the relevancy spectrum in different studied time-intervals, we convert the original time sequence into relevancy time sequence, and can obtain the SMR time series by using the multi-point cumulative sliding mean method. Then we can identify the seismic precursor anomaly. We test this method by taking the time sequence of r/-value in the northern Tianshan region as original data. The result shows that when the studied time-interval is 18 months, the precursor anomaly can be identified bet- ter from sliding mean relevancy. The anomaly corresponding rate is 83 percent, the earthquake corresponding rate is 86 per- cent, and the anomaly is characteristic of the middle term. To try the research on multi-parameter comprehensive application, we take the Kalpin tectonic block in xinjiang as our studied region, and analyze the spatial and temporal abnormal characters of multi-parameter sliding extreme-value relevancy （MSER） before mid-strong earthquakes in the Kalpin block. The result indicates that ECRS and SMR sequence in different time-intervals can not only be used to identify the precursor anomaly of single-item data, but also offer the data of quantitative single-item anomaly for comprehensive earthquake analysis and prediction.

关键词： earthquake corresponding relevancy spectrum(ECRS) sliding mean relevancy (SMR) multi-parameter sliding extreme-value relevancy(MSER) comprehensive precursor anomaly

Moment tensor inversion and source rupture process of the September 27, 2003 M_S=7.9 earthquake occurred in the border area of China, Russia and Mongolia

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Acta Seismologica Sinica(English Edition) 2005年第3期18卷 255-268,378页

作者：赵翠萍陈章立郑斯华刘杰 Institute of Geophysics China Earthquake AdministrationBeijing 100081ChinaInstitute of Earthquake ScienceChina Earthquake AdministrationBeijing 100036ChinaEarthquake Administrationof Xinjiang Uygur Autonomous Regionürümqi830011China Institute of earthquake Science China Earthquake AdministrationBeijing 100036China

plane with the strike of 127°, the dip of 79° and the rake of 171°. The rupture process inversion result of MS=7.9 earthquake shows that the total rupture duration is about 37 s, the scalar moment tensor is M0=0.97 × 1020 N·m. Rupture mainly occurred on the shallow area with 110 km long and 30 km wide, the location in which the rupture initiated is not where the main rupture took place, and the area with slip greater than 0.5 m basically lies within 35 km deep middle-crust under the earth surface. The maximum static slip is 3.6 m. There are two distinct areas with slip larger than 2.0 m. We noticed that when the rupture propagated towards northwest and closed to the area around the MS=7.3 hypocenter, the slip decreased rapidly, which may indicate that the rupture process was stopped by barriers. The consistence of spatial distribution of slip on the fault plane with the distribution of aftershocks also supports that the rupture is a heterogeneous process owing to the presence of barriers.

关键词： earthquake occurred in the boundary area of China Russia and Mongolia moment tensor inversion source rupture process barrier

Hot spot tracking of f lood remote sensing research over the past 22 years:abibliometric analysis using CiteSpace

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地球环境学报 2024年第4期15卷 612-623页

作者： HUO Hong LIU Yan LI Yang Institute of Desert Meteorology China Meteorological AdministrationUrumqi 830002China Wulanwusu Ecology and Agrometeorology Observation and Research Station of xinjiang Urumqi 830002China Field Scientific Experiment Base of Akdala Atmospheric Background China Meteorological AdministrationUrumqi 830002China Meteorological and Technical Equipment Support Center of xinjiang Uygur autonomous region Xinjiang 830002China

Background,aim,and scope In the context of climate change,extreme precipitation and resulting f looding events are becoming increasingly *** sensing technologies are advantageous for monitoring such disasters due to their wide observation range,periodic revisit capabilities,and continuous spatial *** tools enable real-time and quantitative assessment of f lood *** the past 20 years,the field of remote sensing for f loods has seen significant *** the evolution of research hotspots within this field can offer valuable insights for future research *** and methods This study systematically analyzes the development and hotspot evolution in the field of f lood remote sensing,both domestically and internationally during 2000—*** from CNKI(China National Knowledge Infrastructure)and WOS(Web of Science)databases are utilized for this ***(1)A total of 1693 articles have been published in this field,showing a stable growth trend *** contributors include the Chinese Academy of Sciences,Beijing Normal University,Wuhan University,the Italian National Research Council,and National Aeronautics and Space administration.(2)High-frequency keywords from 2000 to 2021 include“remote sensing”“f lood”“model”“classification”“GIS”“climate change”“area”,and“MODIS”.(3)The most prominent keywords were“GIS”(8.65),“surface water”(7.16),“remote sensing”(7.07),“machine learning”(6.52),and“sentinel-2”(5.86).(4)Thirteen cluster labels were identified through clustering,divided into three phases:2000—2009(initial exploratory stage),2010—2014(period of rapid development),and 2015—2021(steady development of remote sensing for f loods and related disasters).Discussion The field exhibits strong phase-based development,with research focuses shifting over *** 2000 to 2009,emphasis was on remote sensing image application and f lood model *** 2010 to 2014,the focus shifted to accura

关键词： f lood remote sensing CiteSpace review knowledge graph analysis

Study on the Precise Location of the xinjiang Yutian M_S7.3 earthquake

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earthquake Research in China 2015年第1期29卷 57-67页

作者： Zhan Xiaoyan Song Xiuqing Chen Xiangjun Wang Jun Miao Fajun Liu Shuangqing Zhu Yuanqing earthquake administration of Jiangsu Province earthquake administration of Shanghai Municipality earthquake administration of xinjiang Uygur autonomous region earthquake administration of Tianjin Municipality

The seismic waveform of the Yutian Ms7. 3 earthquake, xinjiang on February 12, 2014 was recorded clearly and completely by the Digital Seismic Networks of xinjiang, Qinghai, Tibet, and xinjiang Hotan array, so the method of joint location by regional seismic network and seismic array can be used to accurately determine the earthquake source location. The following technologies were used in the process of location：（ 1 ） We selected seismic stations equally located around the epicenter of the Ms 7. 3 earthquake with an average interval of about 15 degrees in the initial location. （2） The recording waveforms of Yutian seismic station were rotated to the radial and tangential directions to precisely obtain the arrival time of S-waves to determine the epicentral distance. （ 3） The velocity model was used in the determination of location of the epicenter, based on the historical records of earthquakes in the area within a radius of 1.0 ° from the source as the center, and the velocity model is obtained after re-fitting and calibration. （4） Based on the waveform records of the Hotan seismic array, the method of waveform beaming was used to determine the azimuths and perform the correction of the epicenter location with these azimuths. （5） The deterministic method was used to measure the source depth. Finally, it is concluded that the Yutian Ms 7. 3 main shock hypocenter location is 36. 197°N, 82. 467°E, focal depth 12km and original time 17：19：48. 2 μm. February 12, 2014.

关键词： Hypocentral location Digital seismic network Seismic array