张会苑, 徐彦. 滇东北地区2008-2012年ML≥3.5地震震源机制[J]. 华北地震科学, 2016, 34(3): 20-27. DOI: 10.3969/j.issn.1003-1375.2016.03.004
引用本文: 张会苑, 徐彦. 滇东北地区2008-2012年ML≥3.5地震震源机制[J]. 华北地震科学, 2016, 34(3): 20-27. DOI: 10.3969/j.issn.1003-1375.2016.03.004
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ZHANG Hui-yuan, XU Yan. Focal Mechanism of ML≥3.5 Earthquake in Northeast Yunnan from 2008 to 2012[J]. North China Earthquake Sciences, 2016, 34(3): 20-27. DOI: 10.3969/j.issn.1003-1375.2016.03.004
Citation: ZHANG Hui-yuan, XU Yan. Focal Mechanism of ML≥3.5 Earthquake in Northeast Yunnan from 2008 to 2012[J]. North China Earthquake Sciences, 2016, 34(3): 20-27. DOI: 10.3969/j.issn.1003-1375.2016.03.004
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滇东北地区2008-2012年ML≥3.5地震震源机制

Focal Mechanism of ML≥3.5 Earthquake in Northeast Yunnan from 2008 to 2012

    摘要
  • 摘要: 选取云南省数字地震台网记录的滇东北地区2008-2012年ML≥3.5地震波形资料，运用全波形模拟的方法，计算得到震源机制解，对其进行综合分析。结果表明：①地震破裂面走向分布具有多样性，节面的倾角较高，滑动方式主要以走滑为主，斜滑和倾滑较少；②主压应力场方向为NNW-SSE，主张应力场方向为NEE-SWW，中等应力轴近于垂直；③该区域大部分地震的震源参数基本相同，但少部分地震的震源机制解也存在一定的差异。

     

    Abstract: Based on data recorded by the Yunnan Digital Seismic Network, we calculate and analyzes the focal mechanism of ML≥3.5 earthquakes in northeastern Yunnan from 2008 to 2012 using the method of full waveform simulation. The result shows:(1) the strike of earthquake rupture surfaces show diversity distribution, but most of the nodal plane has high dip angle, the focal mechanisms are mainly of strike-slip type. (2) The principal compressive stress axis is in the NNW-SSE direction, the principal extension axis is in the NEE-SWW direction, the secondary stress axis is to the vertical. (3) Most of the seismic source parameters are basically the same except that of some small earthquakes.

     

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