Imaging the rupture process of the 10 January 2018 Mw7.5 Swan island, Honduras earthquake  

作　　者：Chuang Cheng Dun Wang 

机构地区：[1]School of Earth Sciences,China University of Geosciences,Wuhan 430074,China

出　　处：《Earthquake Science》2020年第4期194-200,共7页地震学报（英文版）

基　　金：This work is supported by the National Key R&D Program of China(No.2018YFC0603500);Programme on Global Change and Air-Sea Interaction(GASI-GEOGE-02);NSFC(Nos.41474050,41425012,41874062 and 41922025);111 project(No.BP0719022);the Fundamental Research Funds for the Central Universities,China University of Geosciences(Wuhan)CUG170602(D.W.).

摘　　要：The 10 January 2018 Mw7.5 Swan island,Honduras earthquake occurred on the Swan island fault,which is a transform plate boundary between the North American and Caribbean plates.Here we back-project the rupture process of the earthquake using dense seismic stations in Alaska,and find that the earthquake ruptured at least three faults(three stages)for a duration of~40 s.The rupture speed for the longest fault(stage 3)is as fast as 5 km/s,which is much faster than the local shear wave velocity of~4 km/s.Supershear rupture was incidentally observed on long and straight strike-slip faults.This study shows a supershear rupture that occured on a strike-slip fault with moderate length,implying that supershear rupture might commonly occur on large strike-slip earthquakes.The common occurrence of supershear rupture on strike-slip earthquakes will challenge present understanding of crack physics,as well as strong ground motion evaluation in earthquake engineering.

关 键 词：2018 Mw7.5 Honduras earthquake source process BACK-PROJECTION rupture speed supershear rupture 

分 类 号：P315[天文地球—地震学]