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"4?14"玉树地震断裂带对震后地质灾害影响作用分析

DOI: 10.13577/j.jnd.2014.0510, PP. 78-83

Keywords: 玉树地震,断裂带,地质灾害,影响作用,分析

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Abstract:

玉树"4?14"地震发生后,地震造成山体松动、沟道堵塞,引发了许多滑坡、崩塌、泥石流等地质灾害。地质灾害的空间分布受地形地貌、地层岩性和人类工程活动等因素的影响,然而对于地震引发的地质灾害,其空间分布则主要还是受发震断裂的控制。选取巴塘河-结古镇地质灾害集中发育区进行了研究,发现玉树地震断裂对地质灾害发育有以下影响作用:(1)地震断裂两侧地质灾害发育分布存在一定的差异,地震地质灾害的强发育区是在断层两侧2500m范围内,而500m范围内地质灾害最为发育。(2)玉树地震引发的地质灾害主要分布于7度以上烈度区。(3)玉树地震滑坡、崩塌的优势主滑方向为东北―西南,近似垂直于发震断层走向。

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