Abstract：We use SAR data of Sentinal-1A satellite to acquire the descending coseismic line-of-sign(LOS) displacements covering the 2021-03-19 Biru MW5.7 earthquake, and invert the fault geometry parameters and detailed coseismic slip of this event. The results show that the earthquake disrupted a previously undetected buried fault and is characterized by normal-faulting with minor left-lateral strike-slip components. The most slip is concentrated at the depth of 2.4 to 11.2 km with the maximum value of 0.17 m at a depth of 6.4 km. The acquired seismic moment is about 3.6×1017 Nm, equivalent to MW5.7. The accurate fault parameters and source model can provide an important reference for the regional seismic risk assessment and tectonic evolution.
MA Tangjing. Fault Geometry Parameters and Slip Distribution of the 2021 Biru, Tibet MW5.7 Earthquake Constraint by InSAR[J]. jgg, 2023, 43(10): 1086-1089.
