| Recent tectonic stress field zoning in Sichuan-Yunnan region and its dynamic interest |
| |
| 作者姓名： | 崔效锋 谢富仁 张红艳 |
| |
| 作者单位： | Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China |
| |
| 基金项目： | State Key Basic Research Development Program （973 Project） （2004CB418404）, Intensified Tracing Project for the Seismic Condition of NS Seismic zone.Contribution No. 2006A003, Institute of Crustal Dynamics, China Earthquake Administration. |
| |
| 摘 要： | In this paper, we have carefully determined the stress zones in the Sichuan-Yunnan region with reference to the in-situ stress data of hydraulic fracturing and the inverted fault slip data by using the step-by-step convergence method for stress zoning based on focal mechanism solutions. The results indicate that the tectonic stress field in the Sichuan-Yunnan region is divided into 3 stress zones by 2 approximately parallel NNW-trending stress transition belts. The area between the 2 belts is the Sichuan-Yunnan stress zone where the maximum principal stress σ1 is just in the NNW direction. The eastern boundary of Sichuan-Yunnan stress zone （the eastern stress transition belt） is basically consistent with the eastern boundary of Sichuan-Yunnan rhombic block. The western boundary of Sichuan-Yunnan stress zone （the western stress transition belt） is not totally consistent with the western boundary of Sichuan-Yunnan rhombic block. The northern segment of the western stress transition belt extends basically along the Jinshajiang fault and accords with the western boundary of Sichuan-Yunnan rhombic block, while its southern segment does not extend along the southwestern boundary of the rhombic block, i.e., Honghe fault and converge with the eastern stress transition belt, but stretches continuously in the NNW direction and accords with the Yingpanshan fault. We therefore consider that under the combined influence from the northward motion of India Plate, the southeastward shift of east Qinghai-Xizang Plateau and the strong obstruction of South China block, the tectonic stress field in the Sichuan-Yunnan region might not be totally controlled by the previous tectonic frame and new stress transition belt may have possibly formed.
|
| 关 键 词： | 四川 云南 水力压裂 地震 地应力 |
| 文章编号： | 1000-9116（2006）05-0485-12 |
| 收稿时间： | 2006-01-25 |
| 修稿时间： | 2006-06-10 |
Recent tectonic stress field zoning in Sichuan-Yunnan region and its dynamic interest |
| |
| Cui Xiao-feng , Xie Fu-ren and Zhang Hong-yan.Recent tectonic stress field zoning in Sichuan-Yunnan region and its dynamic interest[J].Acta Seismologica Sinica(English Edition),2006,19(5):485-496. |
| |
| Authors: | Cui Xiao-feng Xie Fu-ren and Zhang Hong-yan |
| |
| Institution: | (1) Institute of Crustal Dynamics, China Earthquake Administration, Beijing, 100085, China |
| |
| Abstract: | In this paper, we have carefully determined the stress zones in the Sichuan-Yunnan region with reference to the in-situ stress
data of hydraulic fracturing and the inverted fault slip data by using the step-by-step convergence method for stress zoning
based on focal mechanism solutions. The results indicate that the teconic stress field in the Sichuan-Yunnan region is divided
into 3 stress zones by 2 approximately parallel NNW-trending stress transition belts. The area between the 2 belts is the
Sichuan-Yunnan stress zone where the maximum principal stress σ1 is just in the NNW direction. The eastern boundary of Sichuan-Yunnan stress zone (the eastern stress transition belt) is
basically consistent with the eastern boundary of Sichuan-Yunnan rhombic block. The western boundary of Sichuan-Yunnan stress
zone (the western stress transition belt) is not totally consistent with the western boundary of Sichuan-Yunnan rhombic block.
The northern segment of the western stress transition belt extends basically along the Jinshajiang fault and accords with
the western boundary of Sichuan-Yunnan rhombic block, while its southern segment does not extend along the southwestern boundary
of the rhombic block, i.e., Honghe fault and converge with the eastern stress transition belt, but stretches continuously in the NNW direction and accords
with the Ying-panshan fault. We therefore consider that under the combined influence from the northward motion of India Plate,
the southeastward shift of east Qinghai-Xizang Plateau and the strong obstruction of South China block, the tectonic stress
field in the Sichuan-Yunnan region might not be totally controlled by the previous tectonic frame and new stress transition
belt may have possibly formed.
Foundation item: State Key Basic Research Development Program (973 Project) (2004CB418404), Intensified Tracing Project for the Seismic Condition
of NS Seismic zone.
Contribution No. 2006A003, Institute of Crustal Dynamics, China Earthquake Administration. |
| |
| Keywords: | Sichuan-Yunnan area stress field stress zoning dynamic mechanism |
| 本文献已被 CNKI 维普 SpringerLink 等数据库收录！ |
|
