Stress Inversion and Fault Instability in the Source Region of the 2021 (MS 5.0) Yingjiang Earthquake

On 12 June 2021, an earthquake with MS 5.0 occurred in Yingjiang, adjacent to eastern Myanmar, where seismic activity is frequent due plate collision. To explore the mechanism of this earthquake, regional stress field Yingjiang zone was inverted using focal mechanisms 187 historical earthquakes area. Furthermore, based on obtained orientation principal axes and shape ratio, fault slip tendency (Ts) also estimated evaluate instability study The variation results show that diffusion migration aftershocks suggested strike–slip-type accumulation a compressive axis direction-oriented NNE–SSW. Fault seismogenic faults feature strikes within ranges 40~80° 110~150° dips 60~90° exhibit enhanced coupling. distribution aftershock sequence conjectured have high correlation local fluid likely controlled by hydrated rock-induced ruptures stressed systems near source region. This provides insights into potential risks