| Basic Characteristics of Active Structures in Western Sichuan and Its Vicinity and Strong Earthquake Recurrence Model |
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| 作者姓名： | Xu Xiwei |
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| 作者单位： | Xu Xiwei 1)，Zhang Peizhen 1)，Wen Xueze 2)，Qin Zunli 3)，Chen Guihua 1) and Zhu Ailan 1) 1) Institute of Geology，China Earthquake Administration，Beijing 100029，China 2) Earthquake Administration of Sichuan Province，Chengdu 610041，China 3) Beijing Guodian Water Conservancy and Electrical Engineering Co. Ltd.，Beijing 100024，China |
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| 基金项目： | ThisprojectwassponsoredbytheNationalKeyBasicResearchProject(2004CB418401)andtheStateScienceandTechnologicalKeyBasicProgram(2003DIA6N005),China. |
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| 摘 要： | INTRODUCTIONWestern Sichuan and its vicinity are in the juncture of three big blocks,the Chuandian,theBayan Har andthe South China blocks,whicharelocated onthe eastern margin of the Qinghai-Xizang(Tibet)Plateau(Fig.1).Three groups of active block boundaryfault zones that generate destructiveearthquake occurrence,whichtrend NW-,NE-and nearly SNrespectively,have been developedthere(Zhang Peizhen,et al.,2003).Western Sichuan and its vicinity have such basic tectoniccharacteristics tha…
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| 关 键 词： | 四川 活动性 地震 活动板块 循环模型 |
| 收稿时间： | 2005-09-12 |
| 修稿时间： | 2005-09-20 |
Basic Characteristics of Active Structures in Western Sichuan and Its Vicinity and Strong Earthquake Recurrence Model |
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| Xu Xiwei.Basic Characteristics of Active Structures in Western Sichuan and Its Vicinity and Strong Earthquake Recurrence Model[J].Earthquake Research in China,2006,20(1):75-89. |
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| Authors: | Xu Xiwei |
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| Institution: | Institute of Geology, China Earthquake Administration, Beijing 100029, China |
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| Abstract: | Western Sichuan and its vicinity are located in the juncture of three big active blocks, namely, the Chuandian (Sichuan and Yunnan), the Bayan Har and the South China blocks, on the eastern margin of the Qinghai-Xizang(Tibet) Plateau. Many groups of active faults that are capable of generating earthquakes are developed there. Because there exist lateral secondary active faults, the Chuandian block can be further divided into the central Yunnan and northwestern Sichuan sub_blocks; while the Longmenshan sub_block can be divided on the east end of the Bayan Har block. Joint exploration of deep crustal structure shows that there exist low-velocity and high-conductivity layers in the crust of the Chuandian and Bayan Har blocks, which are one of the important factors that make the upper crust prone to earthquake. The results of geological study and modern GPS observation show that blocks of different orders all have SE-or SSE-trending sliding, clockwise rotation and upwelling movement; but there are some differences in amplitude. This paper has also given the geological or GPS slip rates of main active fault zones and discussed the main scientific problems still existing now. |
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| Keywords: | Western Sichuan Active tectonics Active block Strong earthquake recurrence model |
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