岷县漳县M_S6.6地震近场地震波谱质心分布与发震构造  

The Seismogenic Fault and Near Field Distribution of Spectrum Centroid for Minxian-Zhangxian M_S6.6 Earthquake

作　　者：许康生[1] 曾文浩[1] 

机构地区：[1]中国地震局兰州地震研究所,兰州市东岗西路450号730000

出　　处：《大地测量与地球动力学》2016年第8期666-668,共3页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(41474046)~~

摘　　要：采用近场15个地震台记录的2013-07-22岷县漳县MS6.6地震主震波形,计算平均谱质心频率并给出地理分布。结果表明,高频分布椭圆分布在临潭-宕昌断裂主支的西南侧。由此认为,这次地震的逆冲块体应是处于临潭-宕昌断裂西南侧的另一平行次级断层之间的块体,发震构造并非临潭-宕昌断裂;谱质心最高频率的分布范围揭示了地震波能量辐射最强的区域,与现场考察的宏观极震区相吻合。In this paper,the vertical component seismic record data of 15near-field stations of the MinxianZhangxian MS6.6earthquake are used to analyze the main shock.The average centroid frequency is calculated,and its geographical distribution is given.The results show that the high frequency distribution is in southwestern sides of the Lintan-Tanchang fault,not along the Lintan-Tanchang fault;the elliptical long axis parallels to the fault strike.That is to say,the thrust block of this earthquake is between the southwest side of Lintan-Tanchang fault and the other fault.The geographical distribution of the highest frequency of the spectrum is in agreement with the macroscopic epicenter.It can be considered that the highest frequency region of the spectral centroid is the most serious area of earthquake disaster.

关 键 词：岷县漳县MS6.6地震 地震波 谱质心 地理分布 发震构造 

分 类 号：P315[天文地球—地震学]