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科学通报  2015 

2014年康定Ms6.3级地震发震断裂的古地震

DOI: 10.1360/N972014-01271, PP. 2236-2244

Keywords: 康定地震,发震断裂,鲜水河断裂带,色拉哈段,古地震,离逝时间,复发间隔

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Abstract:

2014年11月22日四川康定发生Ms6.3级地震,综合震源机制解、余震分布、区域断裂展布及震前对区域断裂的野外详细调查研究,发现本次地震的发震断裂是鲜水河断裂带色拉哈段.但对色拉哈段的古地震背景还缺乏深入了解,依据遥感解译、野外考察、4个探槽的开挖、测年样品采集测试等古地震研究技术,综合研究表明(1)鲜水河断裂带色拉哈段全新世以来发生过多次地表破裂型古地震事件,色拉哈段上最新一次地表破裂型古地震事件的发生时间为2027~2359aBP,在本段上发生康定Ms6.3级地震或更强烈的地震事件丝毫不让人意外;(2)色拉哈段上全新世以来的古地震事件表现出明显的丛集期和平静期相间的特征,在6812~11316aBP之间表现出明显的丛集特征,复发周期1000a左右,而在6812aBP以来仅在3840~4295和2027~2359aBP之间发生两次古地震事件,复发间隔明显变长.

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