- 责任者：Peng Hua (Key Lab. of Neotectonic Movement and Geohazards ; Ministry of Land and Resources ; Beijing 100081 ; China) ; Ma Xiumin
- 刊名：Journal of Geomechanics
- 出版年：2009
- 卷期：15(2)
- 关键词：汶川地震2008 ; Wenchuan earthquake 2008 ; 地应力测量 ; geostress surveys ; 龙门山断裂带 ; Longmenshan Fault Zone
- 页码：p.114-130
- 图表：11 illus., 2 tables, 29 refs.
- 分类号：0500
- issnNo：ISSN1006-6616
- isbnNo：CN11-3672/P
After the M8.0 Wenchuan earthquake, it becomes an important concern that whether aftershocks direct to Hanzhong along the Qingchuan fault and a strong aftershock also occur. The study on in situ stress measurements was carried out at Ningqiang region in the northeastern section of the fault in order to master the changes of the coulomb stress in the Qingchuan fault after the earthquake and to identify the development trend of aftershocks, using the hydraulic fracturing in situ stress measurement techniques on June 2 to 28, 2008. The size, orientation and distribution of the tectonic stress in the fault were obtained respectively by the hydraulic fracturing and stress relieving in three boreholes. According to the measured stress data, the direction of the maximum level principal stress is NE-NEE near the fault, and does not accord with the SN-NNE direction of the regional tectonic stress. It is shown that the stress state near the fault changes obviously compared to the regional stress field, affected by the impact of fault activity.