Tectonic Stress Analysis Based on the Crustal Seismic Anisotropy in the Northeastern Margin of Tibetan Plateau
详细信息
- 责任者：Zhang Hui (Lanzhou Institute of Seismology ; China Earthquake Administration ; Lanzhou 730000 ; China) ; Gao Yuan
- 刊名：Chinese Journal of Geophysics
- 出版年：2012
- 卷期：55(1)
- 关键词：构造应力场 ; tectonic stress field ; 青藏高原 ; Qinghai-Tibetan Plateau
- 页码：p.95-104
- 图表：6 illus., 1 table, 38 refs.
- 分类号：0300
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
摘要
In this paper,the data from Gansu Seismological Network (2001~2008) are analyzed with the seismic anisotropy analysis method in crust (SAM). 1 005 shear-wave splitting parameters from 18 stations are obtained. The results show that the crustal seismic anisotropy in the northeastern margin of Tibetan Plateau varies in space. The delay times of slow shear-waves show the variation characteristics of the strength of crustal seismic anisotropy and the average polarizations of fast shear-waves reflect the spacial variation characteristics of regional tectonic stress. It is shown that the interaction of Tibetan Plateau block and Alxa block controls the region of Qilianshan-Hexi corridor active structures, where the direction of tectonic stress is the same as in Tibetan Plateau block.In the southeast of Gansu active structure region, it is regarded that active faults are influential on the stress field,which shows local tectonic stress characteristics.