2012年10月31日三峡库区M_L3.8小震群研究  

RESEARCH OF M_L3.8 SMALL EARTHQUAKE SWARM IN THREE GORGES RESERVOIR AREA ON OCTOBER 31,2012

作　　者：陈俊华[1,2] 姚运生[1,2] 吴海波[1,2] 吴建超[1,2,3] 申学林[1,2] 魏贵春[1,2] 戴苗[1,2] 赵凌云[1,2] 

机构地区：[1]中国地震局地震研究所(地震大地测量重点实验室),武汉430071 [2]湖北省地震局,武汉430071 [3]武汉地震工程研究院,武汉430071

出　　处：《大地测量与地球动力学》2013年第2期31-34,共4页Journal of Geodesy and Geodynamics

基　　金：中国长江三峡工程开发总公司专项基金(SXSN/2377);中国地震局地震研究所所长基金(IS201246114)

摘　　要：对2012年10月31日三峡库区屈原镇ML3.8小震群活动的研究表明,是一次与三峡水库蓄水过程直接相关震群活动;地震主要聚集在仙女山断裂带北端,深约10 km,分布在结晶基底附近;震源体的线性尺度较小,主要限定在5 km的范围;主震和较大地震表现为较典型的构造型地震特征;震群活动为水库高水位蓄水引发仙女山断裂北端构造应力调整,其震群为水库触发型构造地震。The largest magnitude is ML3. 8 small earthquake swarm which occurred on October 30, 2012, Quyuan town of Zigui County in the Three Gorges reservoir region. The studies show that the small earthquake swarm are directly related to the Three Gorges Reservoir impounding; the earthquake swarm gathered in the northern end of Xiannvshan fault zone, earthquakes most located within 10 km near the crystalline basement; linear scale of hypocenter body is smaller, mainly limited radius of 5 km of range ; mainshock and larger seismic performance typical stereotype earthquake characteristics; earthquake swarm triggered the fault structure Xiannvshan stress to adjust in the high water level of the reservoir impounding, small earthquake swarm are reservoir triggered tectonic earthquakes.

关 键 词：小震群 水库触发型构造地震 震源机制 频谱 震源体 

分 类 号：P315.728[天文地球—地震学]