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科学通报  2013 

芦山7.0级地震:特殊的弯曲断层地震

, PP. 1933-1940

Keywords: 芦山地震,弯曲断层,断层位错,库仑应力变化

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Abstract:

精定位结果显示芦山7.0级地震余震的空间分布类似“半碗”形,据此推测主震破裂面为弯曲程度较高的曲面.运动学分析显示,即使断层两盘之间为单一方向的水平相对运动,这种曲面断层的位错方式也存在显著的横向变化.断层面上以逆断为主,但在断层面北翼边缘存在明显的正断位错;另外,断层面的北翼和南翼分别呈现左旋和右旋特征.余震的分布规模显示断层面可能还没完全破坏;曲面断层面上的同震库仑应力变化分析显示,与位错区相邻部位的应力有显著加载,相关部位的地震危险性有可能增加.同震应力分析还显示,曲面断层面上的地震不一定导致位错区应力卸载,显示出芦山地震断层是一种特殊的断层结构,其特殊性可能与断层面高度弯曲有关.

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