停止相揭示大型走滑地震的突然停止

seisMOlOGY Stopping phase reveals abrupt arrest of large strike- slip earthquakes Jesse Kearse1,2* and Yoshihiro Kaneko1 Earthquake magnitude is controlled by where and when rupture propagation stops. However, rupture arrest has rarely been directly observed in near- field seismic records of natural earthquakes. Here, we present systematic near- field observations of ground- motion stopping phases from large strike- slip earthquakes. analysis of 12 global events shows that transient overshoot in fault- parallel ground surface displacement is a robust diagnostic signature of abrupt termination of rupture propagation. Dynamic rupture simulations reveal that near- field ground motions are strongly amplified by low-wavespeed rocks at shallow depth, which enhances the amplitude of displacement overshoot recorded at the surface. …