Characteristics on fault coupling along the Solomon megathrust based on GPS observations from 2011 to 2014

TitleCharacteristics on fault coupling along the Solomon megathrust based on GPS observations from 2011 to 2014
Publication TypeJournal Article
Year of Publication2016
AuthorsKuo Hsu Y-T, Ku C-S, Chen Y-G, Wang Y, Lin Y-N N, Chuang RY, Hsu Y-J, Taylor FW, Huang B-S, Tung H
JournalGeophysical Research Letters
Volume43
Issue16
Pagination8519-8526
Date Published08/2017
Abstract

The Solomon megathrust along the western Solomon arc generated two megathrust earthquakes in the past decade (M-w 8.1 in 2007 and M-w 7.1 in 2010). To investigate the interseismic deformation and inferred coupling on the megathrust, we deployed the first continuous GPS network in the Western Solomon Islands. Our 2011-2014 GPS data and the back slip inversion model show coupling ratio as high as 73% along the southeastern 2007 rupture segment but only 10% on average along the segment of 2010 event. Based on the spatial distribution of coseismic slip, aftershock clusters, derived coupling pattern, and paleogeodetic records, we discovered the former as a semipermanent asperity and the latter as a potential megathrust barrier. We propose that a characteristic earthquake of magnitude not less than M-w 8 will recur in an interval of 100 or more years by either single or doublet earthquake.

DOI10.1002/2016GL070188