中国大陆东部地区及朝鲜半岛上地幔深部间断面和各向异性  

Seismic Discontinuities and Seismic Anisotropy in the Upper Mantle Beneath Eastern Chinese Continent and Korean Peninsula

作　　者：高原[1] 

机构地区：[1]中国地震局地震预测研究所,北京100036

出　　处：《安徽师范大学学报（自然科学版）》2013年第1期5-11,共7页Journal of Anhui Normal University(Natural Science)

基　　金：科技部国际科技合作与交流专项重点项目(2010DFB20190)

摘　　要：使用中国国家地震台网、区域内美国IRIS台站和日本OHP台站,收集到超过三年的震级大于6级的全球范围内的宽频带地震资料,采用接收函数和SKS分裂分析技术,研究了中国大陆东部地区及朝鲜半岛上地幔深部间断面和各向异性。在中国东北地区、华北地区及朝鲜半岛下方,存在大范围的更浅的"410km"间断面和更深的"660km"间断面,该特征与太平洋滞留板块的作用密切相关。区域内的上地幔各向异性主要由上地幔流引起,该地幔流与欧亚板块和太平洋板块相对运动有关,而SKS快轴方向的空间分布揭示了这种复杂的运动模式.This paper studies seismic discontinuities and seismic anisotropy in the upper mantle beneath eastern Chinese continent and Korean peninsula by receiver functions and SKS splitting techniques. It uses broadband seismic data of earthquakes magnitude larger than 6.0 recorded by seismic stations operated by National Seismic Network of China, Incorporated Research Institutions for Seismology and Ocean Hemisphere Project Network of Japan for more than three years. In Northeast China, North China and Korean Peninsula, there are large zones of shallower ＂410km＂ discontinuities and deeper ＂660km＂ discontinuities, which are related with Pacific stagnant slab. Seismic anisotropy in this zone originates from upper mantle flow, which is related with relative movement between Eurasia plate and Pacific plate. Spatial distribution of fast axes of SKS phases indicates this complicated movement pattern.

关 键 词：上地幔间断面 各向异性 接收函数 SKS分裂 中国东部与朝鲜半岛 

分 类 号：P315.61[天文地球—地震学]