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《Northwestern Seismological Journal》 1992-03
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PARAMETERS OF SMALL EARTHQUAKES IN AND AROUND MINLE BASIN

Yao Lixun, Wen Zengping. Yu Xuejun. Wang Jin (Earthquake Research Institute Lanzhou, SSB, 730000, China)  
The digitaL seismograph network set, up by China and France in Zhangye had operated in 1988. There are eleven substations. which were situated in middle segment of Hexi corridor and Qilian Mountain. Using the small earthquakes recorded by Zhangye digital network the Paramrneters of earthquake of Minle. Su'nan. Zhangye and Linze area were measured. The stress drops of these foulareas are a range from 6.1 to 9.5 bar using P wave. and from 26 to 60 bar using S wave, which belong to lower drops The change curve of stress drop versus time had Showed lower value about in a month before Su'nan earthquake (M_s=5.7). This phenomenon may be a preeursor information. In this paper the different results of stress drops measured using P wave and S wave were preliminarily discussed.
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