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Variation of b value with hypocentral depth in Beijing area: Implications for earthquake nucleation
We relocated 2098 earthquakes that occurred in Beijing area between 1980 and 2000 using a double-difference (DD) earthquake location algorithm, and obtained the high-precision relative locations of 1825 events. b values versus depth were investigated with the relocated hypocenters. The results show that the b values decrease with the increasing hypocentral depth systematically. A dramatic variation in b is observed around the depth of 8 km. It indicates that there are more smaller earthquakes at shallow depth (0-8 km), while more larger earthquakes at greater depth (8-25 km). The physical mechanism behind this phenomenon can be explained by the variations in material heterogeneity and lithostatic stress condition. Large earthquakes are more likely to nucleate at greater depth with more homogenous material and higher lithostatic stress. On the basis of the results, we suggest that future strong earthquakes in Beijing area tend to occur below the depth of 8 km.
作 者： ZHU Ailan Xu Xiwei HU Ping Zhou Yongsheng Chen Guihua Gan Weijun 作者单位： ZHU Ailan,Xu Xiwei,Zhou Yongsheng,Chen Guihua,Gan Weijun(Institute of Geology, China Earthquake Administration, Beijing 100029, China)HU Ping(Earthquake Administration of Beijing Municipality, Beijing 100080,China)
刊 名： 科学通报（英文版） SCI 英文刊名： CHINESE SCIENCE BULLETIN 年，卷(期)： 2005 50(7) 分类号： 关键词： b value hypocentral depth earthquake nucleation Beijing area【Variation of b value with hypocentra】相关文章：
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