基于有限断层模型反演方法,利用区域宽频带地震波形数据,反演了 2023年12月18日甘肃临夏积石山6.2级地震的震源破裂过程,获得了积石山地震破裂滑动时空分布:此次地震是逆冲兼少量走滑型地震,破裂持续时间约为9 s,主体能量在前6 s释放,地震破裂主要沿断层走向向NW方向拓展,计算得到的标量地震矩为1.39 × 1018 N·m,相当于Mw6.02,破裂尺度约10 km左右,最大同震滑动量为35 cm.
Source Rupture Process of the 2023 M6.2 Jishishan,Gansu Earthquake Using the Regional Seismic Data
We carried out the inversion for finite-fault rupture process of the 2023 M6.2 Jishishan earthquake using the regional broadband seismic data.The result shows that the seismic fault of the Jishishan earthquake is thrust with slight strike-slip components.The rupture lasted about 9 s and the most seismic energy is mainly released within 6 s.The finite-fault slip model shows that the Jishishan earthquake rupture initiated from the hypo-center and expanded northwestward along the fault strike.The total seismic moment released by this fault is 1.39 × 1018 N·m equal to Mw6.02.The rupture length is about 10 km with a maximum coseismic slip of 35 cm.
The 2023 Jishishan M6.2 earthquakeSource rupture processSlip distribu-tionFinite fault
NETL
NSTL
万方数据
