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利用InSAR资料反演缅甸Mw6.8地震断层滑动分布

DOI: 10.6038/cjg20130914, PP. 3011-3021

Keywords: 缅甸地震,ALOSPALSAR,轨道误差,断层滑动分布

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Abstract:

2011年3月24日缅甸东北部发生Mw6.8级地震.本文利用覆盖该地区的升降轨ALOSPALSAR数据,获取了该次地震的同震形变场,并采用灰度配准技术获取了其地表破裂位移.针对影像中因轨道不精确造成的非线性长波长误差,本文采用二次多项式曲面法予以去除,获取了更为精确的同震形变场.最后,基于弹性半空间形变模型反演了该地震的断层滑动分布.结果表明,该地震断层滑动以左旋走滑为主,兼具少许的倾滑运动分量,断层滑动主要集中分布在断层面0~10km深度范围,最大滑动量达5m,位于地表以下5km深处.反演获得的地震标量矩为2.49×1019N·m,震级约为Mw6.8级.

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