The Source Mechanism and Fault Movement Characterization of the 2022 Mw6.7 Menyuan Earthquake Revealed by the Joint Inversion With InSAR and Teleseismic Observations

• DOI: 10.3389/fenvs.2022.917042
• Publication Date: 2022-06-06T06:36:35Z
• Authors: Xin Bao; Rui Zhang; Ting Wang; Age Shama; RunQing Zhan; Jichao Lv; Renzhe Wu; Yin Fu; Guoxiang Liu
• Keywords: InSAR; finite fault model; Environmental sciences; co-seismic deformation field; fault movement characterization; GE1-350; 01 natural sciences; Menyuan earthquake; 0105 earth and related environmental sciences

The characteristics of active fault movements are essential for estimating the earthquake potential on Tibetan Plateau (TP) in a complex geological setting. 2022 Menyuan Mw6.7 was studied by joint seismological and geodetic methodology to deepen scientific understanding source parameters deformation mechanisms. Firstly, entire InSAR co-seismic field is obtained based ascending descending Sentinel-1A imagery. Subsequently, Bayesian algorithm applied geometry slip distribution determination combining measurements teleseismic data. And movement analyzed. Finally, comprehensive “surface-subsurface" analysis effects caused this carried out results demonstrate that ground settlement uplift induced significant, with maximum relative 56 cm. seismogenic junction Lenglongling (LLL) Tuolaishan (TLS) faults, main body western part LLL fault, high dip left-lateral strike-slip NWW-SEE strike. indicate largest 3.45 m occurs at about 5 km below ground, magnitude Mw6.63. further integrated structure inversion reveals earthquakes occurred North Fault (NLLL) 1986 2016 have contributed earthquake.