山西地区地震震源深度特征统计分析

摘要

根据山西数字地震台网的地震震源深度资料，对山西测震台网2001年1月至2011年12月期间，2535个定位精度为Ⅰ、Ⅱ类且 ML ≥2．0地震，进行震源深度分布特征统计分析。采用网格滑动平均法，统计平均震源深度，结果显示，山西地区平均震源深度为0～40 km ，从0～10 km、11～20 km、21～30 km、31～40 km不同震源深度分布结果来看，山西地区中小地震震源深度以6～20 km为主，个别区域有大于20 km的地震分布。%Focal depths of 2535 earthquakes ,with focus locating accuracies Ⅰ and Ⅱand magnitudes(ML ) larger than 2 .0 ,recorded from Jan .2001 to Dec .2011 are statistically analyzed ,based on the focal depth data from The Digital Seismic Network of Shanxi Province .The average focal depth is calculated by using grid moving average method .it is concluded that focal depths are in range 0~40 km .According to distribution results of different focal depths ranging 0~10 km ,11~20 km ,21~30 km and 31~40 km ,the focal depths of middle and small earthquakes in Shanxi Province are mainly in range of 6~20 km ,except earthquakes with focal depths are greater than 20km in some area .