Spatio-temporal point pattern analysis on Wenchuan strong earthquake

被引:2
|
作者
Shi, Peijian [1 ]
Liu, Jie [2 ]
Yang, Zhen [3 ]
机构
[1] Jiangxi Agr Univ, Coll Agr, Nanchang 330045, Jiangxi, Peoples R China
[2] China Earthquake Networks Ctr, Beijing 100036, Peoples R China
[3] Tsinghua Univ, Dept Precis Instrument & Mechanol, Beijing 100084, Peoples R China
关键词
Wenchuan earthquake; completely spatial randomness; spatio-temporal point pattern; K-function;
D O I
10.1007/s11589-009-0231-y
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
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 aftershocks 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.
引用
收藏
页码:231 / 237
页数:7
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