Spatio-temporal point pattern analysis on Wenchuan strong earthquake  

作　　者：Peijian Shi Jie Liu Zhen Yang 

机构地区：[1]Agricultural College, JiangxiAgricultural University, Nanehang 330045, China [2]China Earthquake Networks Center, Beij'ing 100036, China [3]Department of Precision Instrument andMechanology, Tsingkua University, Beijing 100084, China

出　　处：《Earthquake Science》2009年第3期231-237,共7页地震学报（英文版）

基　　金：supported by the Key Project of Chinese National Programs for Fun-damental Research and Development (973 program) (2008CB425704)

摘　　要：For exploring the aftershock occurrence process of the 2008 Wenchuan strong earthquake, the spatio-temporal point pattern analysis method is employed to study the sequences of aflershocks with magnitude M≥4.0, M≥4.5, and M≥5.0. It is found that these data exhibit the spatio-temporal clustering on a certain distance scale and on a certain time scale. In particular, the space-time interaction obviously strengthens when the distance is less than 60 km and the time is less than 260 h for the first two aftershock sequences; however, it becomes strong when the distance scale is less than 80 km and the time scale is less than 150 h for the last aftershock sequence. The completely spatial randomness analysis on the data regardless of time component shows that the spatial clustering of the aftershocks gradually strengthens on the condition that the distance is less than 60 km. The results are valuable for exploring the occurrence rules of the Wenchuan strong earthquake and for predicting the aftershocks.For exploring the aftershock occurrence process of the 2008 Wenchuan strong earthquake, the spatio-temporal point pattern analysis method is employed to study the sequences of aflershocks with magnitude M≥4.0, M≥4.5, and M≥5.0. It is found that these data exhibit the spatio-temporal clustering on a certain distance scale and on a certain time scale. In particular, the space-time interaction obviously strengthens when the distance is less than 60 km and the time is less than 260 h for the first two aftershock sequences; however, it becomes strong when the distance scale is less than 80 km and the time scale is less than 150 h for the last aftershock sequence. The completely spatial randomness analysis on the data regardless of time component shows that the spatial clustering of the aftershocks gradually strengthens on the condition that the distance is less than 60 km. The results are valuable for exploring the occurrence rules of the Wenchuan strong earthquake and for predicting the aftershocks.

关 键 词：Wenchuan earthquake completely spatial randomness spatio-temporal point pattern K-FUNCTION 

分 类 号：P316.373[天文地球—地震学] O412.1[天文地球—固体地球物理学]