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...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2017
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| Online Access: | https://hdl.handle.net/10356/86298 http://hdl.handle.net/10220/43973 |
| _version_ | 1826118754805743616 |
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| author | Morgan, Paul M. Feng, Lujia Meltzner, Aron Jeffrey Lindsey, Eric Ostrom Tsang, Louisa Lok Hang Hill, Emma Mary |
| 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 |
| author_sort | Morgan, Paul M. |
| collection | NTU |
| 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. |
| first_indexed | 2024-10-01T04:48:39Z |
| format | Journal Article |
| id | ntu-10356/86298 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:48:39Z |
| publishDate | 2017 |
| record_format | dspace |
| spelling | ntu-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 |
| 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 |
| title | 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_short | 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 |
| topic | Fault morphology Sumatran subduction zone |
| url | https://hdl.handle.net/10356/86298 http://hdl.handle.net/10220/43973 |
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