The Jishishan Ms6.2(Mw6.0)Earthquake occurred on December 18th,2023 in Gansu province was a small-scale thrust strong event(M≥ 6)that caused significant casualties.After rapid inversion of rupture process,we performed joint inversions of seismic moment tensor and rupture process,and then compared and analyzed the fault parameters of this earthquake.On this basis,we discussed the disaster mechanisms related to the source process by determining the radiated seismic energy,and obtained the source characteristics within a broad frequency band.The results show that the earthquake fault is more likely to dip to the east.The major rupture area is located between Jishishan County and Dahejia Town,spatially consistent with the meizoseismal area indicated by the intensity distributions.The hanging wall effect,the Doppler effect of the rupture extending towards the northwest and shallower areas,and the amplification of high-frequency waves in shallow soil layers are likely the main source factors for the severe earthquake damage.
万方数据