地震地磁观测与研究2016，Vol.37Issue(1)：38-44,7.DOI:10.3969/j.issn.1003-3246.2016.01.006
利用不同速度模型反演越西MS 5.2地震震源机制解及震源深度
Inversing the focal mechanism and the focal depth of Yuexi MS 5.2 earthquake using the different velocity model
摘要
Abstract
In order to understand the inlfuences of different velocity model in the inversion result of the Sichuan Yuexi MS 5.2 earthquake focal mechanism and focal depth,we perform seismic waveform inversion with the Sichuan and Yunnan Provinces seismic network wideband digital seismic waveform and CAP method,adopting the three different velocity models,respectively. The result showed: ① Using three velocity model,the correlation coefifcients of waveform iftness for all stations are larger than 61%,and inversion results are consistent well,they are stable and reliable. The waveform iftting relationship coefifcient of the model B is the largest,the model should be more suitable for the west region in Sichuan Yuexi region. ②The moment magnitude was MW 5.03. The earthquake focal depth is 10 km. The strike angle,dip angle,and slip angle are 355°,81°,and 29°,respectively,for the one nodal plane. The strike angle,dip angle and slip angle are 260°,61°and 170°,respectively,for another nodal plane. The azimuth angle and elevation angle are 124°and 14°,respectively,for P axis. The azimuth angle and elevation angle are 221°,27°,respectively,for T axis. The results indicate that the fault belongs to sinistral strike-slip type. ③ The one nodal plane parameters accord with big Liangshan fault attitude near the epicenter. Principal compressive stress direction and regional stress direction is consistent. So that, the result indicates that this earthquake activity is due to the sinistral strike-slip movement of big Liangshan fault.关键词
Crust 2.0速度模型/CAP方法/震源机制解/震源深度Key words
Crust 2.0 velocity model/CAP method/focal mechanism solution/focal depth引用本文复制引用
魏娅玲,黄雪影..利用不同速度模型反演越西MS 5.2地震震源机制解及震源深度[J].地震地磁观测与研究,2016,37(1):38-44,7.基金项目
中国地震局测震台网青年骨干培养专项 （）
