尼泊尔MS 8.1地震与青藏高原周边地区多尺度重力场特征分析

摘要

通过分析EGM2008模型提取的青藏高原及周边地区重力场细节信息,概述了尼泊尔MS8.1地震的均衡重力异常特征,并结合GPS数据对研究区的动力学进行综合分析.结果表明,在喜马拉雅山脉地震带区存在重力的正、负值异常区及梯度带,这与该研究区局部应力应变积累、构造活动加剧、深部物质向研究区迁移以及研究区局部密度增高有关.%By analyzing the details of gravity field in the Tibetan Plateau and surrounding areas extracted from EGM2008 model, the isostatic gravity anomaly characteristics of the Nepal MS 8.1 earthquake are summaried. The dynamics of the Tibetan Plateau and its surrounding areas are analyzed synthetically with GPS observation data.The results show that there are positive and negative anomaly areas and gradient zones corresponding to gravity in the seismic zone of the Himalayas, which is related to the accumulation of local stress and strain, the intensification of tectonic activity, the migration of deep material to the area, and the increase of local area density.