| 首都圈地区SKS波分裂研究 |
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| 引用本文： | 常利军,王椿镛,丁志峰.首都圈地区SKS波分裂研究[J].地震学报,2008,30(6). |
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| 作者姓名： | 常利军 王椿镛 丁志峰 |
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| 作者单位： | 中国北京,100081,中国地震局地球物理研究所 |
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| 基金项目： | 中央经公益性科研院所基本科研业务费专项基金，中央经公益性科研院所基本科研业务费专项基金，中央经公益性科研院所基本科研业务费专项基金 |
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| 摘 要： | 通过分析首都圈数字地震台网的49个宽频带和甚宽带台站的远震SKS波形资料,采用最小切向能量的网格搜索法和叠加分析方法,求得每一个台站的SKS快波偏振方向和快、慢波的时间延迟,获得了首都圈地区上地幔各向异性图象.首都圈地区的各向异性快波方向基本上呈WNW-ESE方向,快、慢波时间延迟为0.56-1.56 s.研究表明,首都圈地区上地幔存在明显的各向异性,引起各向异性的主要原因是研究区受太平洋板块俯冲作用下软流圈物质变形,使得上地幔橄榄岩等晶体的晶格优势取向沿物质流动方向.另外,中国大陆受印度板块与欧亚板块的强烈碰撞,大陆西部地壳增厚隆起,同时造成物质东向挤出,使得首都圈地区上地幔物质沿快波方向变形.通过研究区各向异性快波方向和伸展运动方向与GPS测量得到的速度场对比分析,首都圈地区壳幔变形可能具有垂直连贯变形特征.
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| 关 键 词： | 首都圈地区 SKS波 各向异性 快波方向 变形 |
A study on SKS splitting beneath Capital area of China |
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| Chang Lijun,Wang Chunyong,Ding Zhifeng.A study on SKS splitting beneath Capital area of China[J].Acta Seismologica Sinica,2008,30(6). |
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| Authors: | Chang Lijun Wang Chunyong Ding Zhifeng |
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| Institution: | Institute of Geophysics;China Earthquake Administration;Beijing 100081;China |
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| Abstract: | Based on the polarization analysis of teleseismic SKS waveform data recorded at 49 seismic stations involved in Capital Area Seismic Network,the SKS fast-wave polarization direction and the delay time between fast and slow wave arrival at each station were determined by use of a grid searching for the minimum transverse energy and a stacking analysis method,and then the image of upper mantle anisotropy in Capital area was acquired.In the study area,the fast-wave direction is basically in WNW-ESE direction,a... |
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| Keywords: | Capital area SKS wave splitting anisotropy fast-wave direction deformation |
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