地震地磁观测与研究Issue(2)：6-12,7.DOI:10.3969/j.issn.1003-3246.2015.02.002
川东南地区地震视应力时空分布特征
Spatial and temporal distribution of seismic apparent stress in the southeast of Sichuan Province
摘要
Abstract
This paper obtains the following scaling relations after calculating the seismic source dynamically parametric features of earthquakes aboveML3.0, which were observed in southeast Sichuan after Wenchuan earthquake by using the digital seismic data by Sichuan Seismic Network. Those scaling relations are:①Apparent stress &earthquake magnitude.②Stress dropping & earthquake magnitude,③Earthquake magnitude & seismic moment. ④Seismic moment & apparent stress. Based on the above relations, it further calculates features of spatio-temporal changes whose apparent stress is normalized, and thus reaches the following conclusions.①In the viewpoint of temporal distribution, earthequake-prone periods of researched zone ofML≥4.0 earthquakes happen to correspond to periods whose fluctuation of apparent stress is evident. Local intense mining water injection happened to be in the same time. Thus, the apparent stress level of researched zone might refl ect the industrial activity impact on the regional stress fi eld.②In the viewpoint of the spatial distribution, the reason why Zigong-Longchang area has larger magnitude whereas its apparent stress is relatively small might attribute to its insuffi cient release of apparent stress and low tectonic stress level. Special attention should be paid to the probable strong earthquake in this area.关键词
视应力/应力降/震级/地震矩/时空分布Key words
apparent stress/stress dropping/earthquake magnitude/seismic moment/spatial-temporal variation引用本文复制引用
宫悦,龙锋,乔慧珍,赵敏,王宇玺..川东南地区地震视应力时空分布特征[J].地震地磁观测与研究,2015,(2):6-12,7.基金项目
地震科技专项项目 （）
