Abstract:Based on 1 255 seismic source mechanism solutions of MW≥3.5 during 1976-01-01~2015-12-31 provided by Global CMT, we use the FMSI method to invert the stress field in the western Qinghai-Tibet plateau and its adjacent areas (western Xinjiang). We analyze the trend of fault sliding in the west Kunlun fault zone and Altyn Tagh fault zone. The results show that the maximum principal compressive stress axis σ1 in the western Tibetan plateau and neighboring areas is in the NNE-SSW direction and rotates clockwise from west to east; the minimum principal compressive stress axis σ3 is in the NWW-SEE direction. The dip of the maximum principal compressive stress axis σ1 is about 5°~9°, indicating that the tectonic stress field in this area is dominated by horizontal motion. The west Kunlun fault zone and Altyn Tagh fault zone have a strong sliding trend (Ts≥0.5), indicating that the possibility of future destabilization and sliding of the west Kunlun fault zone and Altyn Tagh fault zone is larger.
YANG Ying,XIE Zhaodi,XU Yan et al. Inversion of Tectonic Stress Field and Fault Slip Tendency Analysis in Western Tibetan Plateau and Adjacent Areas[J]. jgg, 2022, 42(7): 694-699.