基于台网目录分析研究汶川8.0级地震余震时空分布特征  

Characteristics of temporal-spatial distribution of the aftershocks of the 2008 M_S8.0 Wenchuan Earthquake

作　　者：李丽 Lok Bijaya Adhikari 李纲[3] 高福旺[3] LI Li1 , Lok Bijaya Adhikari2 , LI Gang3 , GAO FuWanga 3(1 Beijing National Earth Observatory, Institute of Geophysics, China Earthquake Administration, Beijing 100081, China; 2 National Earthquake Center, Department of Mines and Geology, Kathmandu, Nepal; 3 Earthquake Prediction Division, China Earthquake Networks Center, Beijing 100045, Chin)

机构地区：[1]北京国家地球观象台、中国地震局地球物理研究所,北京100081 [2]国家地震中心、尼泊尔矿产与地质局、加德满都 [3]地震预报部、中国地震台网中心,北京100045

出　　处：《地球物理学报》2018年第5期1797-1805,共9页Chinese Journal of Geophysics

基　　金：国家自然科学基金(40974022); 十一五国家科技专项“汶川地震断裂带科学钻探项目”资助

摘　　要：2008年5月12日汶川MS8.0地震主震发生后至2012年5月12日,我国地震台网在龙门山断裂区域内(102°E—105°E,30°N—34°N)共记录93837个地震事件,其中80995次事件含有深度信息.本文以台网地震目录为主要研究对象,分析了汶川地震余震序列的时空分布与演化特征.与构造活动密切相关的余震频次-震级关系变化显示,与主震断裂活动直接相关的余震活动在主震后4个月内基本结束.余震释放能量的空间分布及演化分析显示,在主震后6～24h即有可能捕获未来余震区的大致展布乃至余震发展趋势.The seismograph network in China recorded 93837 seismic events in the area of（102°E—105°E,30°N—34°N）after the 12 May 2008 Wenchuan MS8.0 earthquake within 4 years after the main shock,of which 80995 events were located with focal depth.Based on the network catalogue,the temporal and spatial distribution of the aftershocks was analyzed.The frequency-magnitude relationship of the aftershocks shows that the activity of aftershocks turned to be weak in 4 months after the main shock.The spatial distribution of the energy released by aftershocks shows that even within 6～24 hours after the main shock,the tendency of development of aftershocks in a long time could be captured.

关 键 词：余震 能量释放 汶川8.0级地震 时空扫描 

分 类 号：P315[天文地球—地震学]