| Exploration and Study on Deep Crust Structural Characteristics in the Jiashi-Artux Seismic Region |
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| 作者姓名： | Zhao Jinren Zhang Xiankang Zhang Chengke Ren Qingfang Cheng Shuangxi Zhang Jianshi Nie Wenying PAN Shuzhen |
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| 作者单位： | ResearchCenterofExplorationGeophysics,ChinaSeismologicalBureau,Zhengzhou450002,China |
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| 基金项目： | ContinentalStrongEarthquakeMechanismandForecast(G19980 4 0 70 2 ) ,theproject(96 9130 7)fromtheMinistryofScienceandTechnologyofChinaandtheChinaSeismologicalBureau . |
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| 摘 要： | The data from two deep seismic sounding profiles was processed and studied comprehensively. The results show that crnst-mantle structures in the investigated region obviously display layered characteristics and velocity structures and tectonic features have larger distinction in different geological structure blocks. The boundary interface C between the upper and lower crust and Moho fluctuate greatly. The shallowest depths of C (30.0km) and Moho (45.5km) under Jiashi deepen sharply from Jiashi to the western Kunlun mountain areas, where the depths of C and Moho are 44.0km and 70.0km, respectively. The higher velocity structures in the Tarim massif determine its relatively “stable“ characteristics in crust tectonics. The phenomenon in the Jiashi region, where the distribution of earthquake foci mostly range from 20kin to 40kin in depth, may infer that the local uplift of C and Moho interface, anomalonsly lower velocity bodies and deep large faults control earthquake occurrence and seismogenic processes in the Jiashi strong earthquake swarm.
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| 关 键 词： | 地震区域 深层结构加固 地震地质图 地震波相位 |
Exploration and Study on Deep Crust Structural Characteristics in the Jiashi-Artux Seismic Region |
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| Zhao Jinren,Zhang Xiankang,Zhang Chengke,Ren Qingfang,Cheng Shuangxi,Zhang Jianshi,Nie Wenying,PAN Shuzhen.Exploration and Study on Deep Crust Structural Characteristics in the Jiashi-Artux Seismic Region[J].Earthquake Research in China,2003,17(2):103-112. |
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| Authors: | Zhao Jinren Zhang Xiankang Zhang Chengke Ren Qingfang Cheng Shuangxi Zhang Jianshi Nie Wenying and PAN Shuzhen |
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| Institution: | Research Center of Exploration Geophysics, China Seismological Bureau, Zhengzhou 450002, China;Research Center of Exploration Geophysics, China Seismological Bureau, Zhengzhou 450002, China;Research Center of Exploration Geophysics, China Seismological Bureau, Zhengzhou 450002, China;Research Center of Exploration Geophysics, China Seismological Bureau, Zhengzhou 450002, China;Research Center of Exploration Geophysics, China Seismological Bureau, Zhengzhou 450002, China;Research Center of Exploration Geophysics, China Seismological Bureau, Zhengzhou 450002, China;Research Center of Exploration Geophysics, China Seismological Bureau, Zhengzhou 450002, China;Research Center of Exploration Geophysics, China Seismological Bureau, Zhengzhou 450002, China |
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| Abstract: | The data from two deep seismic sounding profiles was processed and studied comprehensively.The results show that crust-mantle structures in the investigated region obviously displaylayered characteristics and velocity structures and tectonic features have larger distinction indifferent geological structure blocks. The boundary interface C between the upper and lowercrust and Moho fluctuate greatly. The shallowest depths of C (30.0km) and Moho (45.5km)under Jiashi deepen sharply from Jiashi to the western Kunlun mountain areas, where thedepths of C and Moho are 44.0km and 70.0km, respectively. The higher velocity structures inthe Tarim massif determine its relatively "stable" characteristics in crust tectonics. Thephenomenon in the Jiashi region, where the distribution of earthquake foci mostly range from20km to 40km in depth, may infer that the local uplift of C and Moho interface, anomalouslylower velocity bodies and deep large faults control earthquake occurrence and seismogenicprocesses in the Jiashi strong earthquake swarm. |
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| Keywords: | The Jiashi earthquake region Crust-mantle structures Seismogenic background |
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