地震工程学报Issue(4)：1129-1131,3.DOI:10.3969/j.issn.1000-0844.2015.04.1129
2014年阿拉善块体西缘两次中强地震震源机制解
Focal Mechanism Solutions of Two Moderate-strong Earthquakes of 2014 in the West Alax Block
摘要
Abstract
After the Yutian,Xinjiang earthquake of MS7.3 that occurred on February 12,2014,the Mongolia earth-quake of MS4.9 and Hami,Xinjiang earthquake of MS5.1 occurred on the western margin of the Alax block.This shows that seismic activity is strengthening on the western margin of the Alax block.The cut-and-paste (CAP) method performs inversion of the entire profile of an earthquake,the result of which has advantages of relatively small merit that rely on the modeling of speed and lateral movement of the earth’s crust.Its basic principle is split-ting seismic broadband waveform data into Pnl wave and surface-wave parts,calculating the objective error function of the observed and theoretical seismograms,performing a grid search in the assigned parameter space,and search-ing for the focal mechanism and focal (centroid)depth using the two global minimum variances.In this study,using wave data from the Digital Seismological Network of Gansu Province and adopting the CAP method,we determined the focal mechanisms of the two earthquakes.The result shows that the focal mechanisms of the Mongolia MS4.9 and Hami,Xinjiang MS5.1 earthquakes were strike-slip and thrust,respectively.Our analysis concludes that the oc-currence of the Mongolia MS4.9 and Hami,Xinjiang MS5.1 earthquakes exhibits a correlation with the interaction of the Qinghai-Tibet block and the Alax block.关键词
阿拉善块体/CAP方法/震源机制解Key words
Alxa block/CAP method/focal mechanism solution分类
天文与地球科学引用本文复制引用
李春燕,徐辉..2014年阿拉善块体西缘两次中强地震震源机制解[J].地震工程学报,2015,(4):1129-1131,3.基金项目
国家自然科学基金项目(41304048) （41304048）
甘肃省科技计划(145RJZA186) （145RJZA186）
