Imaging the rupture process of the 10 January 2018 MW7.5 Swan island,Honduras earthquake

• 作者: Chuang Cheng Dun Wang
• 来源期刊: 地震学报（英文版）
• 年，卷（期）: 2020,（4）
• 页码范围: 194-200
• 页数: 7页
• 语种: 英文
• DOI: 10.29382/eqs-2020-0194-03

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.