Study on the Relationship between Fluid Infiltration and Qs Tomography of the Crust in Zipingpu Reservoir Area
详细信息
- 责任者：Wang Huilin (Institute of Earthquake Science ; China Earthquake Administration ; Beijing 100036 ; China) ; Zhang Xiaodong
- 刊名：Chinese Journal of Geophysics
- 出版年：2012
- 卷期：55(2)
- 关键词：水库地震 ; reservoir earthquake ; 四川 ; Sichuan Province
- 页码：p.526-537
- 图表：12 illus., 45 refs.
- 分类号：0500
- 出版序号：20130087
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
摘要
The crustal Qs values are imaged in Zipingpu Reservoir Area to obtain shallow crustal characteristics of Qs variation before and after the impoundment of water through two-dimensional seismic attenuation tomography. The infiltration of reservoir water and its impact on the crust are investigated with experimental findings, rocks lithology, faults, hydrological and geological conditions. Simultaneously, the authors discussed the type of seismic activity and physical variety of medium about the cause of earthquake occurrence in the area. The results show that there is a significant lateral heterogeneity in Qs distribution in Zipingpu reservoir area. Approximately, there are low Qs value annular regions surrounding the reservoir. Particularly, the Qs values variation are most closely related to fluid infiltration in the middle part and on the northeast, southwest sides of the reservoir. The authors consider that the reservoir water infiltrates through from the middle part and two sides of the rock fracture zones, joints and fractured regions of the Tongjichang faults, filling with fluid in the rock pores, increasing the internal friction, causing significant attenuation of seismic waves, resulting in a substantial decline in the value of Qs, inducing small earthquake swarms on the southwest and partly on northeast and southeast sides.
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