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Deformation Anomalies before the February 12,2014,M_S7.3 Yutian earthquake

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earthquake Research in China 2014年第4期28卷 483-490页

作者： Gao Lijuan Xing Ximin Gao Ge Zhang Zhiguang Teng Haitao earthquake administration of xinjiang Uygur autonomous region

The Yutian earthquake with M_S7.3 happened on February 12,2014. The precursor monitoring ability is weak in that area. We found tendency anomalies and middle- and short-term anomalies from metal pendulum tilt measurements in Hotan seismic station before the earthquake. And we also compared the anomalies with that of the M_S7.3 Yutian earthquake on March 21,2008. The tendency anomalies measured by the metal pendulum tiltmeter appeared since 2012 as tilting eastward. While the middle- and short-term anomalies were characterized by acceleration,pause and rapid change of tilt rate in two directions. The tendency anomalies of metal pendulum tilt records are the same before the two earthquakes. They both happened in the east direction. However,there are differences in duration,characteristic and earthquake intervals for the middle- and short-term anomalies.

关键词： The Yutian earthquake with Ms7. 3 Metal pendulum tilt-meter Precursor

Analysis of Seismic Activity Characteristics before the Yutian M_S7.3 earthquake,xinjiang on February 12,2014

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earthquake Research in China 2014年第4期28卷 462-474页

作者： Nie Xiaohong Wang Qiong earthquake administration of xinjiang Uygur autonomous region

This paper introduces the geological structure background around the 2014 Yutian Ms7. 3 earthquake area, investigates and analyzes the regime of small earthquake activity and the characteristics of regional seismicity pattern in xinjiang before the earthquake, and compares the characteristics of the regional seismic activity with the 2008 Yutian Ms7.3 earthquake. The results show： ① 2 ~ 3 years before the 2014 Yutian Ms7. 3 earthquake, xinjiang was in a seismic active state with strong earthquake occurring successively, and before the 2008 Ms 7. 3 earthquake, xinjiang was in the quiet state of moderate-small earthquakes with M3. 0 ~ 4. 0. ② Before this Yutian Ms7. 3 earthquake, the regional seismic activity showed a short-term anomaly feature, that is, seismicity of M ≥ 5. 0 earthquakes significantly increased on the Altun seismic zone and in the source area three years before the Ms7.3 earthquake, while a five year long quiescence of seismicity of M ≥4. 0 earthquakes appeared on the east of the source area in a range of about 440kin. Six months before this M7. 3 earthquake, there existed seismic gap of M3. 0 ~ 4. 0 earthquakes and near-conjugate seismic belt magnitude 3. 0 and 4. 0 in the source area. ③ The state of strong earthquake activity and the seismicity pattern of small earthquakes before this Yutian Ms7. 3 earthquake were significantly different to that before the 2008 Yutian Ms7. 3 earthquake, and this may be related to the different seismogenic environments of the two Ms7. 3 earthquakes.

关键词： The Yutian Ms7. 3 earthquake Characteristics of seismic activity Short-termanomaly

Double Difference Location of the Mainshock and Aftershocks of the Hutubi MS6.2 earthquake That Occurred on December 8,2016

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earthquake Research in China 2018年第2期32卷 227-232页

作者： Kong Xiangyan Chen Xiangjun Institute of Geophysics China Earthquake AdministrationBeijing 100081China earthquake Agency of xinjiang Uygur autonomous region Urumqi 830011China

The mainshock and aftershocks of the Hutubi M_S6.2 earthquake on December 8,2016 were relocated by applying the double difference method, and we relocated 477 earthquakes in the Hutubi region. The earthquake relocation results show that the aftershocks are distributed in the east-west direction towards the north side of the southern margin of the Junggar Basin fault,and are mainly distributed in the western region of the mainshock. The distance between the mainshock after relocation and the southern margin of the Junggar Basin fault is obviously shortened. Combined with the focal mechanism and the spatial distribution of the mainshock and aftershocks,it is inferred that the southern margin of the Junggar Basin fault is the main seismogenic structure of the Hutubi earthquake.

关键词： Hutubi earthquake with MS6.2 Aftershock sequence Double difference location method Southern margin of the Junggar Basin fault

A Study on Heterogeneous Cellular Automaton Simulation of the Influencing Factors on Seismicity

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earthquake Research in China 2013年第2期27卷 250-260页

作者： Li Meng Yang Feng earthquake administration of xinjiang Uygur autonomous region

For the purpose of investigating conditions of earthquake pregnancies,a heterogeneous 2-D single fault model with 81 × 81 cells is set up. By using cellular automata models and changing the model heterogeneity and correlation parameters, we compute and get different synthetic event catalogues for analyzing general seismic activity and intensity distribution properties. The results show that different heterogeneous structures produce different seismic sequence types and G-R relationship,so the heterogeneity is an important influencing factor on seismicity. Nevertheless,both the coefficients of stress redistribution and local friction loss can also influence seismicity to some extent. This is possibly useful for further understanding of the complexity of earthquake processes.

关键词： Cellular automata model Heterogeneity Seismicity G-R relationship

The Characteristics and Cause of Seismic Damage of the Jinghe M5.0 earthquake in xinjiang on October 16, 2011

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earthquake Research in China 2012年第4期26卷 532-542页

作者： Chen Jianbo Tan Ming Wu Guodong Hu Weihu Sun Jianing Zhang Zhenbin earthquake administration of xinjiang Uygur autonomous region

The epicenter of the M5.0 earthquake occurring in Jinghe County, xinjiang on October 16, 2011, is located in Tuoli Township. The intensity of the meizoseismal area is VI. The seismic damage investigation shows that the houses are mainly mud-clay style and the seismic damage characteristics take on an obvious regional nature. The damage degree varies relative to the field conditions.

关键词： Jinghe M5.0 earthquake Seismic characteristic Kusongmuqike mountainfront fault Holocene

Characteristics of the Late Quaternary right-lateral strike-slip movement of Bolokenu-Aqikekuduk fault in northern Tianshan Mountains,NW China

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Geoscience Frontiers 2011年第4期2卷 519-527页

作者： Jun Shen Yipeng Wang Yingzhen Li Seismological Bureau of xinjiang Uygur autonomous region Urumqi 830011 China Institute of Geology China Earthquake Administration Beijing 100029 China

The characteristics of the Bolokenu-Aqikekuduk（Bo-A） fault,a right-lateral strike-slip fault that runs for more than 700 km long and obliquely cuts North Tianshan Mountains,are evaluated here based on remote sensing data,and through an analysis of the results from field investigations as well as climate-geomorphic events. The fault is composed of a western segment with a NW strike and an eastern segment with a NWW *** western segment is nearly 250 km long,extending northwestward into Kazakhstan with a right-lateral strike-slip rate of 5 mm/*** domain consists of 4-5 rupture sections,with 3-4 deformation belts,caused by ancient or historical earthquakes,and suggesting the potential for the occurrence of further strong earthquakes（with M≈7.5） in future. The eastern segment of the fault shows a right-lateral strike-slip rate of 1-1.4 mm/a,with the development of 3-4 deformation belts caused by ancient or historical earthquakes,and with a potential for future strong earthquake with M≈7.0. A typical strain partitioning style in the compression area has developed between the intermontane BoA fault and the piedmont thrust structures of Northern Tianshan Mountains,under the effect of oblique compression,as indicated by the piedmont thrust structure and the strike-slip fault in the mountains.

关键词： Strike-slip fault Bolokenu-Aqikekuduk fault Active tectonics Tianshan mountains

The 2008 Nura Mw6.7 earthquake: A shallow rupture on the Main Pamir Thrust revealed by GPS and In SAR

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Geodesy and Geodynamics 2015年第2期6卷 91-100页

作者： Qiao Xuejun Wang Qi Yang Shaomin Li Jie Zou Rong Ding Kaihua Key Laboratory of earthquake Geodesy Institute of Seismology China Earthquake Administration Institute of Geophysics and Geomatics China University of Geosciences Planetary Science Institute China University of Geosciences earthquake administration of the xinjiang Uygur autonomous region

The 2008 Nura Mw6.7 earthquake occurred in front of the Trans-Alai Range, central Asia. We present Interferometric Synthetic Aperture Radar （InSAR） measurements of its coseismic ground deformation that are available for a major earthquake in the region. Analysis of the InSAR data shows that the earthquake ruptured a secondary fault of the Main Pamir Thrust for about 20 kin. The fault plane striking N46~E and dipping 48~SE is dominated by thrust slip up to 3 m, most of which is confined to the uppermost 2-5 km of the crust, similar to the nearby 1974 MwT.0 Markansu earthquake. The elastic model of interseismic deformation constrained by GPS measurements suggests that the two earthquakes may have resulted from the failures of two high-angle reverse faults that are about 10 km apart and rooted in a locked dScollement at depths of 5-6 kin. The elastic strain is built up by a freely creeping decollement at about 16 mm/a.

关键词： Shallow rupture Nura earthquake Main Pamir Thrust Global positioning system (GPS) Interferometric synthetic apertureradar (InSAR) Coseismic deformation Interseismic deformation Southern Tianshan

Horizontal movement and strain characteristics in Tianshan and its adjacent region with GPS deformation data

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Acta Seismologica Sinica(English Edition) 2007年第1期20卷 33-39页

作者：王晓强李杰 Alexander Zubovich 王琪 earthquake administration of xinjiang Uygur autonomous region ürümqi 830011 China Research Station of the Russian Academy of Scienses Bishkek 720049 Kyrgyzstan GPS Laboratory Institute of Seismology China Earthquake Administration Wuhan 430071 China

Based on the multiple-term horizontal velocity solutions of 230 GPS monitoring sites in Tianshan and its adjacent region, the GPS site velocity fields and crustal horizontal strain fields in the area have been obtained. The results show that the crustal shortening rate of Tianshan, with the longitude （77°±1°）E as the boundary, gradually decreased towards two sides, from the south to the north, indicating that the pushing force of plate becomes weaker along with the fold deformation decreasing of the Tianshan. The direction of principal compressive strain of Tianshan and its adjacent area, nearly NNW, is basically perpendicular to the Tianshan cordillera trend, suggesting the distribution and variation of maximum principal compressive stress in Tianshan and its adjacent region resulted from collision and extrusion of Indian Plate. This paper indicates that the maximum shear strain field mainly con- centrates on two areas, one is Isyk lake of North Tianshan, Kyrgyzstan, and the other is the juncture of Jiashi （South Tianshan） and Pamir arc faults. In the above areas, it can be shown from the epicentral distribution that the strong earthquakes mostly occurs at the high shearing strain accumulation filed or its edge.

关键词： GPS Tianshan and its adjacent region horizontal strain rate filed maximum shear strain

A Shear-wave Splitting Study of the Yingjiang M_S6.1 earthquake Sequence Occurring on May 30,2014

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earthquake Research in China 2016年第2期30卷 177-185页

作者： Li Jin Gao Yuan Xu Fukun Xiang Yang Xiang Yuan Liu Geng earthquake administration of xinjiang Uygur autonomous region Urumqi 830011China Institute of earthquake Science CEABeijing 100036China earthquake administration of Yunnan Province Kunming 650041China

earthquakes of M_S5. 6 and M_S6.1 occurred in Yingjiang,Yunnan on May 24 and May 30,2014 respectively. In this paper,we use the waveform data recorded by mobile seismic stations( KAC) which were set up in the source area after the Yingjiang MS5. 6earthquake on May 24,2014 to study the shear-wave splitting characteristics of Yingjiang M_S6.1 earthquake sequence with the SAM method. The result shows that predominant polarization of fast shear-waves before the M_S6.1 earthquake is consistent with the direction of regional principal compressive stress,and predominant polarization of fast shear-waves before the M_S6.1 earthquake show better consistency and smaller dispersion compared to after the M_S6.1 earthquake,and there may be a deflection for the fast shearwaves predominant polarization between the M_S6.1 earthquake sequence and foreshock sequence. We found that the time-delays generally exhibited a lower level before the M_S6.1earthquake and a relatively higher value after the M_S6.1 earthquake.

关键词： Yingjiang earthquake sequence Foreshock Shear-wave splittingPolarization of fast shear-waves Time-delays