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西南天山-帕米尔2008年10月5日MS6.7级地震震源机制研究

DOI: 10.6038/cjg20130214, PP. 504-512

Keywords: 震源过程,有限断层模型,模拟退火,西南天山-帕米尔

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Abstract:

利用IncorporatedResearchInstitutionsforSeismology(IRIS)提供的远场宽频带P波及SH波记录,基于点源模型及有限断层模型方法,反演研究了2008年10月5日发生在中国天山与塔吉克斯坦交界区域的一次MS6.7级地震震源机制.结果表明,本次地震为南倾高角度稍具小幅度走滑分量的逆冲破裂事件,断层走向为57.2°,倾角为42.7°,震源深度为7.4km.根据研究结果,我们认为这是一次逆断层加小幅度走滑分量的地震事件,推断该地震可能与帕米尔向北北西方向挤压西南天山,在帕米尔-西南天山边界引发的逆冲断层活动有关.

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