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Basic Characteristics of Active Structures in Western Sichuan and Its Vicinity and Strong Earthquake Recurrence Model

查看全文 作　　者：Xu [1]Xiwei;Zhang [1]Peizhen;Wen [2]Xueze;Qin [3]Zunli;Chen [1]Guihua;Zhu [1]Ailan 高影响力作者 机构地区：[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高影响力机构 出　　处：《Earthquake Research in China》索引2006年第20卷第1期,共15页高影响力期刊 基　　金：ThisprojectwassponsoredbytheNationalKeyBasicResearchProject(2004CB418401)andtheStateScienceandTechnologicalKeyBasicProgram(2003DIA6N005);China. 摘　　要：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. 关 键 词：四川 活动性 地震 活动板块 循环模型
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