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2014年5月30日盈江6.1级地震序列剪切波分裂研究
李金1) 高原2) 徐甫坤3) 向阳1) 向元1) 刘庚2)
1)新疆维吾尔自治区地震局,乌鲁木齐市新市区科学二街338号 830011;2)中国地震局地震预测研究所,北京 100036;3)云南省地震局,昆明 650224
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。
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
DOI:
分类号:
基金项目:
A Shear-wave Splitting Study of the Yingjiang MS 6.1 Earthquake Sequence Occurring on May 30,2014
Li Jin1),Gao Yuan2),Xu Fukun3),Xiang Yang1),Xiang Yuan1),and Liu Geng2)
1) Earthquake Administration of Xinjiang Uygur Autonomous Region,Urumqi 830011,China;2) Institute of Earthquake Science,CEA,Beijing 100036,China;3) Earthquake Administration of Yunnan Province,Kunming 650041,China
Abstract:
Earthquakes of MS5. 6 and MS6. 1 occurred in Yingjiang,Yunnan on May 24 and May 30, 2014 respectively. In this paper,we use the waveform data recorded by mobile seismic stations ( KAC) which were set up in the source area after the Yingjiang MS5. 6 earthquake on May 24,2014 to study the shear-wave splitting characteristics of Yingjiang MS6. 1 earthquake sequence with the SAM method. The result shows that predominant polarization of fast shear-waves before the MS6. 1 earthquake is consistent with the direction of regional principal compressive stress,and predominant polarization of fast shear-waves before the MS6. 1 earthquake show better consistency and smaller dispersion compared to after the MS6. 1 earthquake,and there may be a deflection for the fast shearwaves predominant polarization between the MS6. 1 earthquake sequence and foreshock sequence. We found that the time-delays generally exhibited a lower level before the MS6. 1 earthquake and a relatively higher value after the MS6. 1 earthquake.
Key words:  Yingjiang earthquake sequence  Foreshock Shear-wave splitting  Polarization of fast shear-waves  Time-delays