THE KINEMATIC CHARACTERISTICS OF THE M_S6.5 LUDIAN YUNNAN EARTHQUAKE IN 2014

作者：Xuhua Zhao · 发表于：Seismology and Geology · 年份：2014 · 被引用次数：2 · 研究领域：Seismology and Earthquake Studies、earthquake and tectonic studies、Earthquake Detection and Analysis

We employ multistep inversions in the frequency or time domain to infer the kinematic characteristics of the MS6. 5 Ludian,Yunnan earthquake in 2014,mainly using regional broadband waves recorded by the China Digital Seismic Network. In this paper,we firstly invert the focal mechanism solution and the centroid depth of the Ludian earthquake,and then determine the bestfitting finite-fault model and the dominant rupture direction. According to the above results,we further analyze and discuss the kinematic characteristics of the Ludian earthquake,and explore preliminarily the reason for the serious disaster caused by this event.We take into account some factors which could have effects on the inversion results,e. g. the use of different waves and simplified 1-D velocity models. Several test results indicate that the misfit between observed waves and synthetics is better,if we use the full waves and the 1-D velocity model( Model M2) in this study area. According to the point-source model( focal mechanism solution),this event occurs on a true rupture plane( strike = 342°,dip = 83°,and rake =- 34°),which shows a left-lateral strike-slip faulting with a minor normal oblique component. The centroid in the horizontal direction is located at nearly 5. 4km southeast of the epicenter( 27. 109°N /103. 354°E),and the bestfitting centroid depth is around 4. 4km. The total scalar moment,M0,is retrieved with an average value of 2. 1 × 1018N·m( or moment magnitude MW6. 1).The rupture history i...