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《Earthquake》 2003-01
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Discussion on medium parameter of Xinjiang Atushi(M=7.1) earthquake and Xinjiang Jiashi swarm

GU Jinping1, WANG Haitao2, ZHAO Cuiping2, YANG Xin2(1. Center for Analysis and Prediction, CSB, Beijing 100036, China; 2. Seismological Bureau of Xinjiang Uygur Autonomous Region, Urumchi 830011, China)  
Based on propagation characteristics of the regional seismic body wave the authors try to determine and study the deviation coefficient of the initial amplitude of the seismic event, and to get precursory information of moderately strong earthquakes. According to this idea the deviation coefficient of the initial amplitude of the seismic events is calculated from 1992 to 1999, latitude is from 38°N to 42°N and longitude is from 74.5°E to 79°E in Xinjiang region of China (from Wuqia to Keping along the Southern segment of Tianshan range). The possible precursors are discussed in temporalspatial evolution process of this medium parameter around Atushi strong earthquake and Jiashi swarm. The research indicates that the strong earthquake happens in transitional area of the parameter variation; also in an overage region with large change of the stress environment gradient. From the temporal view of point, the strong events usually occur at the period when parameter value from lower to higher or after it. The tectonic stress background of strong events is studied according to the physical significance of parameter in this paper.
【Fund】: 地震联合基金会资助项目(100090)
【CateGory Index】: P315.3
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