中国大陆强地震成组活动迁移及其机理分析

Abstract

Abstract: The migration pattern of grouping great earthquakes (M_S37.5) in western part of China′s continent (to west of 108°E) since the beginning of last century, and that of grouping strong earthquakes (M_S36.0) in North China-Northeast China area (108°~135°E, 30°~50°N) since 1920s of last century, have been studied. During three periods for 1902.01~1916.12; 1920.01~1947.03; 1947.07~1988.12 within 1900~2001, there occurred three grouping activities of strong shallow earthquakes (M_S37.5) in western part of China's continent, and from 1977.01 to 2001.12 occurred tow great earthquake (Mani shock with M_S=7.5 in 1997.11and Kunlun event M_S=8.1 in 2001.11) might be the beginning of the fourth grouping activities. And the areas of the four grouping earthquake activities in the different periods were not repeated, and showing a clockwise migration pattern. During the time period of 1927 to 1998, three earthquake groups occurred in North and Northeast China and South and North Tianshan Mountain of Xinjiang Autonomous Region; from 1927.01 to 1948.12, 1966.01 to 1976.12 and 1979.01 to 1998.12, the migration pattern shows a back-and forth way. The grouping strong earthquakes in a main area, the grouping earthquakes occurred in one active tectonic zone or several one nearby. The mechanism analysis of migration process of grouping seismicity has been done by using a model of fault interaction and stress transition.

Key words: China′ continent, Grouping earthquake activity, Migration pattern, Mechanism analysis

CLC Number:

P315.5

FU Zheng-xiang, JIN Xue-shen, SHAO Hui-cheng, DING Xiang. Migration of the grouping strong earthquakes in China′s continent and its mechanism analysis[J]. EARTHQUAKE, 2005, 25(4): 65-74.

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Migration of the grouping strong earthquakes in China′s continent and its mechanism analysis

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