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《Advance in Earth Sciences》 2004-S1
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RESEARCH ON THE FORMATION MECHANISM OF STRONG SEISMIC BELTS AND THE CHARACTERISTICS OF SEISMIC ACTIVITY IN THE EAST PART OF INVERTED-TRIANGLE-SHAPED FAULT BLOCK IN THE NORTHWEST PLATEAU OF SICHUAN

JIANG Liang-wen~(1,2), WANG Shi-tian~2, LI Yu-sheng~2, WANG Yun-sheng~2 (1. The Second Survey and Design Institute, Ministry of Railways, Chengdu 610031,China; 2. Chengdu University of Technology, Chengdu 610059 ,China)  
The east part of inverted-triangle-shaped fault block in the northwest of Siehuan is situated in the northwest plateau of Siehuan and the valley of transitional area between that and Sichuan basin, of the northeast edge of Qingzang plateau. Due to its specific tectonic environment and intensive modern crust movement, earthquakes occur frequently. Based on study of geological and seismic data, according to field investigation, fractal analysis,we discover the distribution characteristics and formation mechanism of strong seismic belts in the present in the east part of the triangle fault block and two fault belts in northern and southeastern boundary under recent E-W compress regional tectonic stress-strain field and A-type tectonic system controlling earthquakes; we also discover the seismic activity law of this region. Generally speaking, seismic activity belts located near 104°E. in the form of dense strip. Besides, the frequency and maximum earthquake magnitude inside the fault block are higher than those in boundary faults and the seismic intensity in the north is far larger than that in the south. As far as the space is concerned, intensive earthquakes in 104°E can transfer from boundary faults to those inside and vice versa, when it comes to he time, the active period and dormant period alternate and the earthquake whose magnitude is larger than 7.0 tends to accelerated.
【Fund】: 国土资源部“九五”重点基础研究项目(编号:9501114)资助
【CateGory Index】: P315
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