中国大陆7级大地震强余震震级和空间分布特征  

Magnitude and Spatial Distribution of Strong Aftershocks of M7 Earthquakes in China's Mainland

作　　者：吕晓健[1,2] 高孟潭[2] 郝平[1] 陈丹[1] 

机构地区：[1]中国地震局地震预测研究所,北京100036 [2]中国地震局地球物理研究所,北京100081

出　　处：《地震》2010年第2期61-70,共10页Earthquake

基　　金：中国地震局地震预测研究所基本科研业务经费(02077906和02092406)资助

摘　　要：本文研究了中国大陆1966年以来15次7.0～7.9级地震序列强余震空间分布和震级分布特征。研究结果表明：①强余震与主震震级差（ΔM）与频度（N）的统计关系服从指数分布,统计得到了全部序列平均B值为0.72,12个走滑型地震序列平均B值为0.73;②走滑型地震序列强余震优势分布范围是5～59 km,非走滑型序列优势分布为10～29 km,并且强余震与主震震中距离服从正态分布。Using the earthquake sequence data of MS7.0~7.9 earthquakes since 1966 in China's Mainland,we study the characteristics of magnitude difference distribution between main shocks and their strong aftershocks and the spatial distribution characteristics of strong aftershocks away from their main shocks.The results show that the magnitude difference distribution obeys intercepted exponential distribution and obtain the B value of 0.72 for the whole earthquake sequences and the B value of 0.73 for the strike-slip earthquake sequences,while the spatial distribution of strong aftershocks obeys normal distribution and the dominated distribution area of strong shocks of strike-slip earthquakes is 5~59 km and 10~29 km for the no-strike-slip earthquakes.

关 键 词：中国大陆 地震序列 强余震 空间分布 震级分布 

分 类 号：P315.7[天文地球—地震学]