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2011年盈江M_s≥4.0地震序列震源机制解与发震构造研究

Focal Mechanism Solutions and Seismogenic Structures of Yingjiang M_s≥4.0 Earthquake Sequences in 2011

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【作者】 赵小艳韩立波龙锋

【Author】 ZHAO Xiao-yan1,HAN Li-bo2,LONG Feng3(1.Earthquake Administration of Yunnan Province,Kunming 650024,Yunnan,China)(2.Institute of Geophysics,CEA,Beijing 100081,China)(3.Earthquake Administration of Sichuan Province,Chengdu 610041,Sichuan,China)

【机构】 云南省地震局中国地震局地球物理研究所四川省地震局

【摘要】 基于云南数字地震台网和腾冲火山台网宽频带波形记录,采用CAP方法反演了2011年盈江MS5.8地震序列主震及MS≥4.0前震、余震的震源机制解。结果显示:主震震源深度为9km,与该事件的定位结果相一致;震源机制解的节面之一走向248°,倾角77°,滑动角19°。结合余震、烈度分布以及震区的活动构造,判定该节面代表了主震的发震断层面,相应的发震断层应是震区附近的北东向大盈江断裂。主震主压力轴方位为20°,除MS4.7余震为正断型地震外,其他7次地震都为纯走滑型地震,都具有NNE-SSW向近水平的P轴,与该区历史地震震源机制主压应力优势方向一致。综合应力场及构造分析表明,盈江MS5.8地震的发震动力学环境是:受印度板块向欧亚板块北东向挤压和缅甸弧对保山—腾冲地块北东向俯冲的双重作用,保山—腾冲地块呈现北东向水平运动,导致的大盈江断裂带左旋走滑错动的结果。

【Abstract】 Basing on the broadband waveforms recorded by Yunnan and Tengchong Volcanic Digital Seismic Networks,we inversed the focal mechanism solutions of the main shock of Yingjiang MS5.8 earthquake sequences and MS≥4.0 foreshocks and aftershocks in 2011 by using CAP method.The results showed that the focal depth of the main shock is 9 km,which was consistent with the location depth of Yingjiang MS5.8 earthquake.Combining with the distributions of aftershocks and intensity and the active geologic structures in seismic area,the nodal plane which had the strike of 248°,rake of 77° and dip of 19° was identified to be the seismogenic fault plane of the main shock,and its corresponding seismogenic fault was Dayingjiang Fault with northeast trending in seismic area.The direction of principal compressive stress axis of the main shock is 20°.The MS4.7 aftershock was normal-fault earthquake,the other 7 earthquakes was strike-slip earthquakes with nearly horizontal P-axis in NNE-SSW direction,which was consistent with principal compressive stress axis of the focal mechanism solutions in historical earthquakes.Combination with stress field and tectonic settings comprehensively,the seismogenic dynamic background of Yingjiang MS5.8 earthquake was under the double effects which were northeastward compression of India plate to Eurasia plate and northeastward subduction of Burma arc to Baoshan-Tengchong block.The Baoshan-Tengchong block moved horizontally along NE direction,which leaded to the left-lateral strike-slip motion of Dayingjiang Fault

【基金】 大地震中长期危险性判定及地震大形势预测关键技术研究(2012BAK19B01)子专题南北地震带强震综合预测与跟踪方法研究(2012BAK19B01-07);云南省地震局2010年青年基金“2008年盈江地震震源机制研究(201002)”联合资助
  • 【文献出处】 地震研究 ,Journal of Seismological Research , 编辑部邮箱 ,2012年04期
  • 【分类号】P315.33
  • 【被引频次】17
  • 【下载频次】161
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