先存构造对1985年8月23日新疆乌恰M w6.9地震地表破裂几何形态和变形样式的制约
赫洪哲 , 李涛 , 陈杰 , 钱黎
地球科学 ›› 2024, Vol. 49 ›› Issue (02) : 511 -521.
先存构造对1985年8月23日新疆乌恰M w6.9地震地表破裂几何形态和变形样式的制约
Deformation Pattern of the 23 August 1985 Wuqia M w 6.9 Earthquake Surface Rupture (Xinjiang Province): Control from Inherited Folding-Related Structures
,
1985年8月23日发生在新疆维吾尔自治区乌恰县境内的M w6.9地震,是有地震仪器记录以来,帕米尔-南天山会聚带内发生的最强地震事件之一,也是碰撞造山带前陆地区少数形成显著地表破裂的强震事件之一. 在前人研究工作基础上,我们通过对震后Worldview卫星影像、无人机影像、野外调查获得的天然断层露头和人工探槽断层剖面的综合分析,对乌恰地震地表破裂的几何形态、变形样式、下伏断层结构进行了约束. 研究表明,地表破裂东段呈弧形展布,其走向、运动性质和下伏断层倾角变化显著;相比较而言,西段虽因后期地表过程改造而非常不连续,其运动性质、走向和下伏断层倾角却更为稳定. 由于地表破裂东、西两段分别位于明尧勒背斜南翼向形枢纽的南、北两侧,我们推测这种变形特征的显著差异,可能与向形枢纽两侧先存构造(先存的明尧勒背斜褶皱变形过程中形成的弯滑断层)的发育情况不同有关.
逆断层 / 地震地表破裂 / 先存构造 / 帕米尔 / 南天山
thrust fault / earthquake surface rupture / inherited structure / Pamir / Southern Tian Shan
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国家重点研发计划项目(2022YFC3003700)
中国地震局地质研究所基本科研业务专项(IGCEA1920)
第二次青藏高原综合科学考察研究(2019QZKK0901)
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