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鲁甸6.5级地震发震断层判定及其构造属性讨论

DOI: 10.6038/cjg20140931, PP. 3060-3068

Keywords: 鲁甸地震,地震断层,地震地表破裂带,静态库仑应力,青藏高原

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Abstract:

鲁甸6.5级地震是川滇菱形块体南南东向运动在青藏高原东缘与华南地块相互作用边界变形带上发生的一次中等强度地震.尽管野外应急科学考察没有发现明显的地震地表破裂带,但云南昭通防震减灾局局域地震台网记录到的余震条带状分布、震后科学考察获得的地震烈度长轴方位和极震区地震裂缝等显示出发震断层为NW向包谷垴—小河断裂,左旋走滑性质,属大凉山断裂南端部组成部分;库仑应力计算表明,鲁甸地震可对周边活动断层系历史地震空段产生应力加载作用,其地震危险性不容忽视.

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