Comprehensive Analysis on Present Tectonic Stress Field in Urumqi
详细信息
- 责任者：Li Yingzhen (Xinjiang Earthquake Administration ; Urumqi 830011 ; China) ; Shen Jun
- 刊名：Acta Seismologica Sinica
- 出版年：2011
- 卷期：33(1)
- 关键词：构造应力场 ; tectonic stress field ; 震源机制 ; focal mechanism ; 新疆 ; Xinjiang
- 页码：p.15-27
- 图表：5 illus., 4 tables, 18 refs.
- 分类号：0300
- issnNo：ISSN0253-3782
- isbnNo：CN11-2021/P
摘要
Urumqi City is located in the central part of northern piedmont of Tianshan Mountains. The mean direction of principal compressive stress in the central section of northern Tianshan Mountains deduced from the focal mechanism solutions is around N10°E, with a clear feature of gradual change from west to east. In the region of Urumqi City, the direction derived from focal mechanism solutions of moderate-strong earthquakes is N15°-20° E. The principal stress direction found from fault striation inversion is N17°W-N2° E. The phenomena indicate that a tension stress in the shallow layers in front part of the compressive fault-fold region has been superposed to the regional NNE-SSW trending compressive tectonic stress and makes the direction of local principal compressive stress turn to NEE-SWW. This is one of the causes why the normal faults, such as the Jiujiawan fault groups, were developed in Urumqi City.
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