采用sPn震相确定四川长宁地区M≥4.0地震震源深度  

Calculation of the focal depth of the Sichuan Changning M≥4.0 earthquakes based on sPn seismic phases

作　　者：魏娅玲[1] 蔡一川[1] 

机构地区：[1]四川省地震局,四川成都610041

出　　处：《四川地震》2014年第3期24-27,共4页Earthquake Research in Sichuan

基　　金：中国地震局测震台网青年骨干培养专项(专题编号:20140320);国家自然科学基金重大项目(编号:41090292)资助

摘　　要：通过对2013年1月至11月四川长宁地区M≥4.0地震震相的分析得出,在震中距大于260 km时,四川数字地震台网部分台站可记录到较为清晰的sPn震相。本文采用sPn和Pn震相确定震源深度的方法,分别对长宁地区2个M≥4.0地震的震源深度进行了重新计算,2次地震的震源深度较浅,均小于3 km,是较为精确的震源深度值。According to the seismic phases sPn analysis method, we select the data of the two M≥4.0 earthquakes occurred in Changning County, Sichuan Province, from January to November, 2013, which were recorded by the Sichan Digital Seismograph Network and seismic phases have clear sPn waveform relatively with the epicenter distance of more than 260 km. In this article, we use seismic phases of sPn and Pn to calculate the two earthquakes depths. The focal depths of Changning earthquakes are 2.7 km and 2.9 km respectively.

关 键 词：SPN震相 震相特征 震源深度 震中距 

分 类 号：P315.63[天文地球—地震学]