The seismicity in the middle section of the Altyn Tagh Fault system revealed by a dense nodal seismic array  

作　　者：Shi Yao Tao Xu Yingquan Sang Lingling Ye Tingwei Yang Chenglong Wu Minghui Zhang 

机构地区：[1]Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,100029,China [2]Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen,518055,China [3]Innovation Academy for Earth Science,Chinese Academy of Sciences,Beijing,100029,China [4]University of Chinese Academy of Sciences,Beijing,100049,China [5]School of Information Engineering,Shandong University of Aeronautics,Binzhou,256603,China

出　　处：《Earthquake Research Advances》2024年第3期7-15,共9页地震研究进展（英文）

基　　金：supported by the Second Tibetan Plateau Scientific Expedition and Research Program (STEP, 2019QZKK0701-02);the National Natural Science Foundation of China (Grant 42104102 and 42130807)。

摘　　要：The left-lateral Altyn Tagh Fault(ATF) system is the northern boundary of the Qinghai-Xizang Plateau, separating the Tarim Basin and the Qaidam Basin. The middle section of ATF has not recorded any large earthquakes since1598 AD, so the potential seismic hazard is unclear. We develope an earthquake catalog using continuous waveform data recorded by the Tarim-Altyn-Qaidam dense nodal seismic array from September 17 to November23, 2021 in the middle section of ATF. With the machine learning-based picker, phase association, location, match and locate workflow, we detecte 233 earthquakes with M_L-1–3, far more than 6 earthquakes in the routine catalog. Combining with focal mechanism solutions and the local fault structure, we find that seismic events are clustered along the ATF with strike-slip focal mechanisms and on the southern secondary faults with thrusting focal mechanisms. This overall seismic activity in the middle section of the ATF might be due to the northeastward transpressional motion of the Qinghai-Xizang Plateau block at the western margin of the Qaidam Basin.

关 键 词：Altyn Tagh Fault Machine learning SEISMICITY Dense seismic array 

分 类 号：P315.5[天文地球—地震学]