青藏高原东北缘地壳各向异性及其动力学意义

谢振新; 吴庆举; 张瑞青

doi:10.6038/cjg20170623

青藏高原东北缘地壳各向异性及其动力学意义

- 1.
  中国地震局地球物理研究所, 北京 100081
- 2.
  北京大学地球与空间科学学院, 北京 100871
基金项目:
国家自然科学基金（41274088），地震行业科研专项（201308011）资助

详细信息

作者简介:
谢振新, 男, 1992年生, 在读博士生, 主要从事地球深部构造方面的研究.E-mail:xiezhenxin_xzx@163.com

通讯作者: 吴庆举, 男, 1966年生, 研究员, 从事地震学、地球动力学方面的研究.E-mail:wuqj@cea-igp.ac.cn

中图分类号: P315

收稿日期: 2016-12-08

修回日期: 2017-04-20

上线日期: 2017-06-05

Crustal anisotropy beneath northeastern margin of the Tibetan Plateau and its dynamic implications

- 1.
  Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
- 2.
  School of Earth and Space Sciences, Peking University, Beijing 100871, China

More Information

Corresponding author: WU Qing-Ju, E-mail: wuqj@cea-igp.ac.cn

Received Date: 08 December 2016

Revised Date: 20 April 2017

Available Online: 05 June 2017

摘要

摘要:
利用中国地震科学探测台阵项目二期（ChinaArray Ⅱ）81个台站的地震数据，使用时间域反褶积方法提取接收函数，挑选满足要求的高质量Ps震相，通过改进的剪切波分裂计算方法获取了53个台站共130对高质量各向异性参数对.地壳各向异性分析指出，研究区东南部地区地壳各向异性方向为NWW向，与XKS各向异性方向、GPS速度场三者近平行关系，说明该地区在青藏高原向欧亚大陆增生的过程中是一个耦合的连贯变形过程；位于研究区中、北部地区的地壳各向异性方向表现为NEE-SWW或E-W方向，与GPS速度场方向一致，而与XKS结果的偏振方向大角度相交，说明该地区受到青藏高原下地壳塑性管道流的影响，可能存在壳幔解耦作用.
- 青藏高原东北缘 /
- 地壳各向异性 /
- Ps震相 /
- 剪切波分裂
Abstract:
We present anisotropy results using Ps phase in receiver functions, which are computed from the data of 81 seismic stations in northeastern margin of Tibetan Plateau. We use a modified automatic shear-wave splitting method to compute the anisotropic parameters using selected Ps phase. We would like to discuss about dynamic mechanism in this area using crustal anisotropy associated with the result of SKS-splitting and surface constraints like GPS velocity. The result can be summarized as follows. The large delay times imply that the crustal anisotropy is mainly derived from middle to lower crust rather than upper crust. In the southeastern part of the research area, crustal anisotropy agrees well with the result computed form SKS phase and GPS velocity directions trending NWW-SEE or E-W. This result implies a vertically coherent deformation in the area as the directions of crustal anisotropy trend to be perpendicular to the direction of normal stress. In the middle and north part of the research area, the fast polarization direction of crustal anisotropy is NEE-SWW or E-W, parallels the direction of GPS velocity, and differs from the direction of the result of XKS-phase. This result implies that decoupled deformation in this area is associated with middle to lower crustal flow.
- NE Tibetan Plateau /
- Crustal anisotropy /
- Ps-phase /
- Shear-wave splitting

HTML全文

图 1
研究区主要构造带及台站分布

Figure 1.
Map showing the major tectonic belts and distribution of seismic stations

下载: 全尺寸图片幻灯片

图 2
Ps震相各向异性分裂计算示例

Figure 2.
A example of shear-wave splitting analysis

下载: 全尺寸图片幻灯片

图 3
挑选的地震事件后方位角分布黑色十字代表事件分布, 星代表研究区.

Figure 3.
The distributions of back azimuth for selected eventsBlack crosses show the events, and star represents the study area.

下载: 全尺寸图片幻灯片

图 4
所有事件的快剪切波偏振方向等面积投影玫瑰图

Figure 4.
Equal-area project rose diagram of fast shear-wave polarization of all selected events

下载: 全尺寸图片幻灯片

图 5
研究区台站下方各向异性综合分析

Figure 5.
Comprehensive analysis diagram of anisotropy beneath seismic stations

下载: 全尺寸图片幻灯片

图 6
地壳各向异性方向与GPS速度方向夹角分布

Figure 6.
Distribution of angles between fast polarization directions and GPS velocity vectors

下载: 全尺寸图片幻灯片

图 7
地壳各向异性方向与地壳应力方向夹角分布

Figure 7.
Distribution of angles between fast polarization directions and crustal stress vectors

下载: 全尺寸图片幻灯片

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