Study on the crustal stress field of the Tengchong volcanic area

Shuzhong Sheng, Yongge Wan, Changsheng Jiang, Xiaoshan Wang, Shanshan Liang, & Xiaohui Hu

Submitted August 14, 2019, SCEC Contribution #9672, 2019 SCEC Annual Meeting Poster #190

Based on the observation data of the Tengchong volcanic area from January 2011 to April 2019 in the Bulletin of Seismological Observations of Chinese stations, we calculated the crustal stress field in Tengchong volcanic area by using composite focal mechanism method. In order to obtain reliable stress field of study area, we applied the Double Difference Algorithm to relocate the seismic events, and their high-precision relative position were obtained. On the basis of relocation, the study of the stress field along the fault was carried out, and the influence of event position on the stress field research results was analysed. The study results show that: First, the calculated results of stress field are consistent, by using event location of the original location in the bulletin or the relocated, it indicates that the influence of the error of event location parameter can be neglected when the data is sufficient, and also reflects the stability of composite focal mechanism method. Second, the crustal stress field in Tengchong volcanic area is strike-slip type, the orientation of principal compressive stress axis is NE-SW, and the orientation of principal extension stress axis is SE-NW, the principal compressive and the principal extension stress axis are nearly horizontal, the dip angle of intermediate principal stress axis is relative large. Third, there is variation in the stress field on the fault, which is consistent with the tectonic movement characteristics of the fault in the study area.

Key Words
Stress field,composite focal mechanism,Double-difference location,Tengchong volcanic area,fault

Sheng, S., Wan, Y., Jiang, C., Wang, X., Liang, S., & Hu, X. (2019, 08). Study on the crustal stress field of the Tengchong volcanic area. Poster Presentation at 2019 SCEC Annual Meeting.

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Stress and Deformation Over Time (SDOT)