Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/88909
Title: Afterslip following the 2007 Mw 8.4 Bengkulu earthquake in Sumatra loaded the 2010 Mw 7.8 Mentawai tsunami earthquake rupture zone
Authors: Tsang, Louisa Lok Hang
Hill, Emma Mary
Barbot, Sylvain
Qiu, Qiang
Feng, Lujia
Hermawan, Iwan
Banerjee, Paramesh
Natawidjaja, Danny H.
Keywords: Afterslip
Postseismic Deformation
DRNTU::Science::Geology
Issue Date: 2016
Source: Tsang, L. L. H., Hill, E. M., Barbot, S., Qiu, Q., Feng, L., Hermawan, I., Banerjee, P.,et al. (2016). Afterslip following the 2007 Mw 8.4 Bengkulu earthquake in Sumatra loaded the 2010 Mw 7.8 Mentawai tsunami earthquake rupture zone. Journal of Geophysical Research: Solid Earth, 121(12), 9034-9049. doi:10.1002/2016JB013432
Series/Report no.: Journal of Geophysical Research: Solid Earth
Abstract: The 12 September 2007 Mw 8.4 Bengkulu earthquake in Sumatra marked the first in a modern series of large earthquakes along the Mentawai section of the Sunda megathrust. Understanding the spatial distribution of coseismic slip and ensuing afterslip is important for assessing seismic hazard in neighboring unruptured regions of the megathrust. We reestimate the spatial distribution of coseismic slip during this earthquake with improved coseismic offsets from the Sumatran GPS Array (SuGAr) and estimate afterslip following this earthquake with SuGAr postseismic time series spanning ∼6.3 years after the earthquake. We invert for the spatiotemporal distribution of afterslip with the principal component analysis‐based inversion method (PCAIM), and we take into account viscoelastic deformation by incorporating into the inversion the estimation of strain within ductile deforming blocks located at asthenospheric depths. Our results suggest cumulative afterslip concentrated within, updip, and downdip of the 2007 coseismic rupture area and shallow afterslip that borders and overlaps the 2010 Mw 7.8 Mentawai earthquake rupture zone. The cumulative contribution of stress changes due to the coseismic event and the ensuing afterslip likely increased strain rates in the shallow portion of the megathrust adjacent to the Mentawai earthquake rupture area, potentially promoting its rupture in 2010.
URI: https://hdl.handle.net/10356/88909
http://hdl.handle.net/10220/46986
ISSN: 2169-9313
DOI: 10.1002/2016JB013432
Rights: © 2016 American Geophysical Union. This paper was published in Journal of Geophysical Research: Solid Earth and is made available as an electronic reprint (preprint) with permission of American Geophysical Union. The published version is available at: [http://dx.doi.org/10.1002/2016JB013432]. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EOS Journal Articles

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