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2014年8月3日云南鲁甸MW6.1(MS6.5)地震破裂过程

DOI: 10.6038/cjg20140930, PP. 3052-3059

Keywords: 鲁甸地震,波形反演,破裂过程

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Abstract:

2014年8月3日云南鲁甸(MW6.1,MS6.5)地震是一次规模不大、但灾害严重的走滑型地震事件.受走滑型地震辐射图型的影响,远震地震资料在特定方位上信噪比不高,给此次地震发震断层面的确定造成了一些干扰.本文概述了鲁甸地震发生后2.4小时发布的作为地震应急响应的破裂过程快速反演工作,以及随后对反演结果的修订工作.修订结果中,两个双力偶节面的反演都显示破裂方向朝地表和走向方向扩展.结合现有的烈度分布和余震精确定位结果,根据破裂方向和烈度与余震分布的优势方向的一致性,确定鲁甸地震是发生在走向162°,倾角86°的近乎垂直于地面的以左旋走滑为主的断层面上的一次破裂事件.根据破裂过程反演得到的震源时间函数,大部分地震矩在破裂开始后2~5s内集中释放.比较集中的地震矩释放过程可能是此次地震面波震级明显高于矩震级,且造成严重地震灾害的原因之一.

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