摘要
2014年5月24、30日,云南盈江分别发生了MS5.6和MS6.1地震。本文利用2014年5月24日盈江MS5.6地震后在震源区附近架设的流动地震台卡场台(KAC)记录到的波形资料,使用SAM分析方法对盈江MS6.1地震序列进行剪切波分裂参数变化特征的研究。初步结果表明,MS6.1地震震前序列快剪切波优势偏振方向与区域主压应力方向一致,震前的快剪切波偏振方向与震后相比具有更好的一致性及更小的离散度,且盈江MS6.1地震余震序列的快剪切波偏振方向较前震序列可能有一个偏转。对比MS6.1地震的震前、震后发现,震前6天的数据显示出剪切波分裂时间延迟总体上呈现较低的水平,而震后的时间延迟值相对较高。
The Ms5. 6 and Ms6. 1 earthquakes occurred respectively in Yingjiang,Yunnan on May 24 and 30,2014. In this paper,we use the waveform data recorded by mobile seismic stations（ KAC） which set up in the source area after the Yingjiang Ms5. 6 happened on May 24,2014,study the shear-wave splitting characteristics of Yingjiang Ms6. 1 earthquake sequence with the SAM method. The result showed that predominant polarization of fast shear-waves before the Ms6. 1 earthquake consistent with the direction of regional principal compressive stress,predominant polarization of fast shear-waves before the Ms6. 1 earthquake showed better consistency and smaller dispersion compared with that after the Ms6. 1 earthquake. There may be a deflection for the fast shear-waves predominant polarization between the Ms6. 1 earthquake sequence and foreshock sequence. We found that the time-delays generally exhibit a lower level before the Ms6. 1 earthquake,and that value is relatively high after the Ms6. 1 earthquake.
出处
《中国地震》
北大核心
2015年第2期245-252,共8页
Earthquake Research in China
基金
2015年度震情跟踪合同制定向工作任务(2015010113
2015010301)
新疆地震局基金(201401)联合资助
关键词
盈江地震序列
前震
剪切波分裂
快波偏振方向
时间延迟
Yingjiang earthquake sequence Foreshock Shear-wave splitting Polarization of fast shear-waves Time-delays
