Sibling earthquakes generated within a persistent rupture barrier on the Sunda megathrust under Simeulue Island

A section of the Sunda megathrust underneath Simeulue is known to persistently halt rupture propagation of great earthquakes, including those in 2004 (Mw 9.2) and 2005 (Mw 8.6). Yet the same section generated large earthquakes in 2002 (Mw 7.3) and 2008 (Mw 7.4). To date, few studies have investigate...

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Main Authors: Morgan, Paul M., Feng, Lujia, Meltzner, Aron Jeffrey, Lindsey, Eric Ostrom, Tsang, Louisa Lok Hang, Hill, Emma Mary
Other Authors: Asian School of the Environment
Format: Article
Language:English
Published: 2017
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Online Access:https://hdl.handle.net/10356/86298
http://hdl.handle.net/10220/43973
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-862982020-09-26T21:29:37Z Sibling earthquakes generated within a persistent rupture barrier on the Sunda megathrust under Simeulue Island Morgan, Paul M. Feng, Lujia Meltzner, Aron Jeffrey Lindsey, Eric Ostrom Tsang, Louisa Lok Hang Hill, Emma Mary Asian School of the Environment Earth Observatory of Singapore Fault morphology Sumatran subduction zone A section of the Sunda megathrust underneath Simeulue is known to persistently halt rupture propagation of great earthquakes, including those in 2004 (Mw 9.2) and 2005 (Mw 8.6). Yet the same section generated large earthquakes in 2002 (Mw 7.3) and 2008 (Mw 7.4). To date, few studies have investigated the 2002 and 2008 events, and none have satisfactorily located or explained them. Using near-field InSAR, GPS, and coral geodetic data, we find that the slip distributions of the two events are not identical but do show a close resemblance and largely overlap. We thus consider these earthquakes “siblings” that were generated by an anomalous “parent” feature of the megathrust. We suggest that this parent feature is a locked asperity surrounded by the otherwise partially creeping Simeulue section, perhaps structurally controlled by a broad morphological high on the megathrust. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) Published version 2017-11-01T07:29:37Z 2019-12-06T16:19:55Z 2017-11-01T07:29:37Z 2019-12-06T16:19:55Z 2017 Journal Article Morgan, P. M., Feng, L., Meltzner, A. J., Lindsey, E. O., Tsang, L. L. H., & Hill, E. M. (2017). Sibling earthquakes generated within a persistent rupture barrier on the Sunda megathrust under Simeulue Island. Geophysical Research Letters, 44(5), 2159-2166. 0094-8276 https://hdl.handle.net/10356/86298 http://hdl.handle.net/10220/43973 10.1002/2016GL071901 en Geophysical Research Letters © 2017 The Authors. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made. 8 p. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Fault morphology
Sumatran subduction zone
spellingShingle Fault morphology
Sumatran subduction zone
Morgan, Paul M.
Feng, Lujia
Meltzner, Aron Jeffrey
Lindsey, Eric Ostrom
Tsang, Louisa Lok Hang
Hill, Emma Mary
Sibling earthquakes generated within a persistent rupture barrier on the Sunda megathrust under Simeulue Island
description A section of the Sunda megathrust underneath Simeulue is known to persistently halt rupture propagation of great earthquakes, including those in 2004 (Mw 9.2) and 2005 (Mw 8.6). Yet the same section generated large earthquakes in 2002 (Mw 7.3) and 2008 (Mw 7.4). To date, few studies have investigated the 2002 and 2008 events, and none have satisfactorily located or explained them. Using near-field InSAR, GPS, and coral geodetic data, we find that the slip distributions of the two events are not identical but do show a close resemblance and largely overlap. We thus consider these earthquakes “siblings” that were generated by an anomalous “parent” feature of the megathrust. We suggest that this parent feature is a locked asperity surrounded by the otherwise partially creeping Simeulue section, perhaps structurally controlled by a broad morphological high on the megathrust.
author2 Asian School of the Environment
author_facet Asian School of the Environment
Morgan, Paul M.
Feng, Lujia
Meltzner, Aron Jeffrey
Lindsey, Eric Ostrom
Tsang, Louisa Lok Hang
Hill, Emma Mary
format Article
author Morgan, Paul M.
Feng, Lujia
Meltzner, Aron Jeffrey
Lindsey, Eric Ostrom
Tsang, Louisa Lok Hang
Hill, Emma Mary
author_sort Morgan, Paul M.
title Sibling earthquakes generated within a persistent rupture barrier on the Sunda megathrust under Simeulue Island
title_short Sibling earthquakes generated within a persistent rupture barrier on the Sunda megathrust under Simeulue Island
title_full Sibling earthquakes generated within a persistent rupture barrier on the Sunda megathrust under Simeulue Island
title_fullStr Sibling earthquakes generated within a persistent rupture barrier on the Sunda megathrust under Simeulue Island
title_full_unstemmed Sibling earthquakes generated within a persistent rupture barrier on the Sunda megathrust under Simeulue Island
title_sort sibling earthquakes generated within a persistent rupture barrier on the sunda megathrust under simeulue island
publishDate 2017
url https://hdl.handle.net/10356/86298
http://hdl.handle.net/10220/43973
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