利用精定位小震资料反演1933年叠溪M71/2地震震源断层面参数  

The Seismogenic Fault Plane Parameters Inversion of the 1933 M71/2 Diexi Earthquake Using Precisely Located Small Earthquakes

作　　者：李峰 张效亮 贾启超 刘华国 龚飞 Li Feng Zhang Xiaoliang Jia Qichao Liu Huaguo Gong Fei(China Earthquake Disaster Prevention Center, Beijing 100029, China)

机构地区：[1]中国地震灾害防御中心,北京100029

出　　处：《震灾防御技术》2017年第3期565-573,共9页Technology for Earthquake Disaster Prevention

基　　金：地震行业专项中国地震活动断层探察--南北地震带北段(201408023)岷江断裂和虎牙断裂活动性鉴定分项目;中国地震灾害防御中心主任基金联合资助

摘　　要：1933年叠溪发生71/2级强震,关于此次地震的发震构造存在较大争议,有些学者认为NW向松坪沟断裂是此次地震的发震构造,另有学者认为近NS向岷江断裂南段才是这次地震的发震构造。本文根据成丛小震发生在大震断层面附近的原则,利用1990—2014年精定位小震目录,根据万永革等(2008)提出的震源断层面拟合方法,反演了叠溪地震震源断层走向、倾角和位置。断层走向和倾角分别是172.8°和82.9°,倾向偏向西。本文结果更支持岷江断裂南段为叠溪地震发震构造这一结论。There is a strong controversy about the seismogenic fault of 1933 Diexi M7 1/2 earthquake. Some scholars believe that the NW-SE striking Songpingpu fault is the seismogenic fault of the earthquake. While others believe N-S striking southern segment of Minjiang fault is the seismogenic fault of the earthquake. According to the principle of the information of small earthquakes in the vicinity of fault, the fault plane parameters are inversed using the method proposed by Wan et al. （2008）, with 1990--2014 precisely located small earthquakes. The strike and dip angel are 172.8° and 82.9°. The results of this paper prefer the southern segment of Minjiang fault as the seismogenic fault of the 1933 Diexi M7 1/2 earthquake.

关 键 词：1933年叠溪地震 岷江断裂 发震构造 断层反演 小震精定位 

分 类 号：P315.33[天文地球—地震学]