2009年姚安6.0级地震序列研究  

Study on the source parameters of the Yao'an M_S 6.0 earthquake sequence in 2009

作　　者：杨晶琼[1] 杨周胜[1] 

机构地区：[1]云南省地震局,中国昆明650224

出　　处：《地震地磁观测与研究》2013年第3期52-57,共6页Seismological and Geomagnetic Observation and Research

基　　金：地震行业专项;中深井综合地球物理监测试验与资料解析(201008009)

摘　　要：2009年7月9日在云南省姚安县发生M_S6.0地震,利用云南区域数字地震台网记录的M_L≥2.0余震波形记录,通过对S波观测记录谱进行传播路径、场地响应和仪器响应等影响的逐一消除,得到131个地震的震源谱。进而根据Brune圆盘震源模型,利用遗传算法计算地震矩、应力降、震源半径等震源参数。结果表明,该地震序列的M_O在10^(12)—10^(16)N·m,与近震震级有很好的线性关系,与震源半径呈线性关系;应力降与近震震级有一定线性趋势相关性;拐角频率和地震矩M_O之间有明显的依赖关系。Yao＇an Ms 6.0 earthquake on July 9,2009 occurred in Yunnan. Using waveforms of the ML≥2.0 earthquakes recorded by Yunnan Regional Digital Network, by removing propaga- tion,site and instrument effects from the displacement spectra of the S_wave recordings, we obtain the source parameters of 131 ML≥2.0 earthquakes based on the Brune disc model and Genetic algorithm, namely, the seismic moment M0, stress drop Ao and rupture radius r, The results show that there is a good linear relation between M0 （1012-1016 N·m） and local magnitude ML; M0 and rupture radius r. Ao seems dependent on ML;fc increases with M0 decreasing according to the lgfc_M0 relation.

关 键 词：震源参数 遗传算法 震源谱 地震序列 姚安6 0级地震 

分 类 号：P315[天文地球—地震学]