2015年尼泊尔强震序列导致的喜马拉雅山峰位移场

发布时间：2018-06-08 11:35

本文选题：年尼泊尔地震序列 + 震源破裂模型　；参考：《地震地质》2017年04期

【摘要】：基于2015年尼泊尔地震序列的破裂模型及均匀弹性半空间模型,计算了该地震序列导致的喜马拉雅山脉及邻区的位移场。结果表明:尼泊尔地震序列所导致的位移场呈南北两侧水平分量向震中会聚的分布形式,水平位移最大达871~962mm,并且距震中越远水平位移量越小,但震中南侧的水平位移量随震中距衰减更快。震中北侧出现了明显沉降,最大沉降量达376~474mm,大部分震中及以南区域出现了明显隆升,最大值达626~677mm。文中还估计了该地震序列导致的周围喜马拉雅山脉部分山峰的位移场,结果表明希夏邦马峰的位移最大,水平位移达393mm,下沉36mm;世界最高峰珠穆朗玛峰近S向水平移动36mm,下沉9mm;其他山峰的位移因与到尼泊尔地震序列的震中距离和方位的不同而不同。
[Abstract]:Based on the rupture model of the 2015 Nepal earthquake sequence and the uniform elastic half-space model, the displacement field in the Himalayas and adjacent areas caused by the earthquake sequence is calculated. The results show that the displacement field caused by the Nepal earthquake sequence is distributed in the form of horizontal component converging from the north to the south toward the epicenter. The maximum horizontal displacement is 871 ~ 962 mm, and the farther away from the epicenter, the smaller the horizontal displacement is. But the horizontal displacement on the south side of the epicenter decays more rapidly with the epicentral distance. Significant subsidence occurred on the north side of the epicenter with a maximum subsidence of 376m 474mm, and a significant uplift occurred in most of the epicentre and south of the epicenter, with a maximum value of 626677mm. The displacement field of some peaks in the surrounding Himalayas caused by the earthquake sequence is also estimated. The results show that the displacement of Xichabanma peak is the largest. The horizontal displacement is 393mm, and the subsidence is 36mm; the world's highest peak, Mount Everest, moves 36 mm horizontally near S, sinking 9mm; the displacement of other peaks is different from the epicenter distance and direction of the earthquake sequence to Nepal.
【作者单位】：防灾科技学院;中国地震局地球物理研究所;
【基金】：国家自然科学基金(NSFC41674055) 河北省地震科技星火计划(DZ20170109001)共同资助
【分类号】：P315.2

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