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科学通报  2011 

利用GPS位移反演日本Mw9.0仙台地震及Mw7.9强余震静态位错模型

, PP. 1999-2005

Keywords: 俯冲带大地震,位错反演,Mw,7.9,余震,GPS,数据

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Abstract:

基于GPS观测的Mw9.0日本仙台地震同震形变及震后8h的地表形变,考虑分层介质模型的影响,反演了主震及震后8h的断层的位错分布.结果显示,主震位错对应的矩震级为Mw8.98,最大同震位错量可达23.3m,在震中区显示出纯逆冲特性,震中两侧断层错动显示出一定的走滑分量.另外,约90%的地震能量发生在40km深度以上.而由震后8h的地表形变反演的结果显示,这一期间释放能量约相当于一个Mw8.13的地震,位错主要分布在主震破裂的西南区域,最大位错量约1.5m,破裂峰值区与Mw7.9强余震有明显的对应关系,暗示震后8h的断层错动主要是由Mw7.9强余震引起的.另外,主震破裂的深部延伸面在震后0.2~0.4m的滑动可能主要是无震余滑.

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