A unified GPS-based earthquake catalog for the Sumatran plate boundary between 2002 and 2013

We have compiled the first self-consistent GPS-based earthquake catalog for the Sumatran plate boundary. Using continuous daily position time series from the Sumatran GPS Array (SuGAr), we document 30 earthquakes which occurred within or outside the SuGAr network from August 2002 through the end of...

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Main Authors: Feng, Lujia, Hill, Emma Mary, Banerjee, Paramesh, Hermawan, Iwan, Tsang, Louisa L. H., Natawidjaja, Danny H., Suwargadi, Bambang W., Sieh, Kerry
Other Authors: Earth Observatory of Singapore
Format: Article
Language:English
Published: 2015
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Online Access:https://hdl.handle.net/10356/104650
http://hdl.handle.net/10220/25990
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1046502020-09-26T21:36:49Z A unified GPS-based earthquake catalog for the Sumatran plate boundary between 2002 and 2013 Feng, Lujia Hill, Emma Mary Banerjee, Paramesh Hermawan, Iwan Tsang, Louisa L. H. Natawidjaja, Danny H. Suwargadi, Bambang W. Sieh, Kerry Earth Observatory of Singapore DRNTU::Science::Geology::Volcanoes and earthquakes We have compiled the first self-consistent GPS-based earthquake catalog for the Sumatran plate boundary. Using continuous daily position time series from the Sumatran GPS Array (SuGAr), we document 30 earthquakes which occurred within or outside the SuGAr network from August 2002 through the end of 2013, and we provide estimates of both vertical and horizontal coseismic offsets associated with 1 M9.2, 3 M8, 6 M7, 19 M6, and 1 M5.9 earthquakes, as well as postseismic decay amplitudes and times associated with 9 M > 7 earthquakes and 1 M6.7 earthquake. For most of the previously studied earthquakes, our geodetic catalog provides more complete coseismic displacements than those published, showing consistent patterns of motion across a large range of distances. For many of the moderate to large earthquakes, we publish their coseismic displacements for the first time, providing new constraints on their locations and slip distributions. For the postseismic time series, we have tackled the challenge of separating the signals for individual events from the overlapping effects of many other earthquakes. As a result, we have obtained either new or much longer time series than previously published. Based on our long time series, we find logarithmic decay times ranging from several days to more than 20 years, and sometimes a second decay time is needed, suggesting that when studying large to great Sumatran earthquakes, we need to consider multiple postseismic mechanisms. Our geodetic catalog provides rich spatial and temporal Sumatran earthquake cycle information for future studies of the physics and dynamics of the Sumatran plate boundary. Published version 2015-06-22T06:56:44Z 2019-12-06T21:36:57Z 2015-06-22T06:56:44Z 2019-12-06T21:36:57Z 2015 2015 Journal Article Feng, L., Hill, E. M., Banerjee, P., Hermawan, I., Tsang, L. L. H., Natawidjaja, D. H., et al. (2015). A unified GPS-based earthquake catalog for the Sumatran plate boundary between 2002 and 2013. Journal of geophysical research: solid earth, 120(5), 3566-3598. 2169-9313 https://hdl.handle.net/10356/104650 http://hdl.handle.net/10220/25990 10.1002/2014JB011661 en Journal of geophysical research: solid earth ©2015 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 paper can be found at the following official DOI: [http://dx.doi.org/10.1002/2014JB011661]. 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. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Science::Geology::Volcanoes and earthquakes
spellingShingle DRNTU::Science::Geology::Volcanoes and earthquakes
Feng, Lujia
Hill, Emma Mary
Banerjee, Paramesh
Hermawan, Iwan
Tsang, Louisa L. H.
Natawidjaja, Danny H.
Suwargadi, Bambang W.
Sieh, Kerry
A unified GPS-based earthquake catalog for the Sumatran plate boundary between 2002 and 2013
description We have compiled the first self-consistent GPS-based earthquake catalog for the Sumatran plate boundary. Using continuous daily position time series from the Sumatran GPS Array (SuGAr), we document 30 earthquakes which occurred within or outside the SuGAr network from August 2002 through the end of 2013, and we provide estimates of both vertical and horizontal coseismic offsets associated with 1 M9.2, 3 M8, 6 M7, 19 M6, and 1 M5.9 earthquakes, as well as postseismic decay amplitudes and times associated with 9 M > 7 earthquakes and 1 M6.7 earthquake. For most of the previously studied earthquakes, our geodetic catalog provides more complete coseismic displacements than those published, showing consistent patterns of motion across a large range of distances. For many of the moderate to large earthquakes, we publish their coseismic displacements for the first time, providing new constraints on their locations and slip distributions. For the postseismic time series, we have tackled the challenge of separating the signals for individual events from the overlapping effects of many other earthquakes. As a result, we have obtained either new or much longer time series than previously published. Based on our long time series, we find logarithmic decay times ranging from several days to more than 20 years, and sometimes a second decay time is needed, suggesting that when studying large to great Sumatran earthquakes, we need to consider multiple postseismic mechanisms. Our geodetic catalog provides rich spatial and temporal Sumatran earthquake cycle information for future studies of the physics and dynamics of the Sumatran plate boundary.
author2 Earth Observatory of Singapore
author_facet Earth Observatory of Singapore
Feng, Lujia
Hill, Emma Mary
Banerjee, Paramesh
Hermawan, Iwan
Tsang, Louisa L. H.
Natawidjaja, Danny H.
Suwargadi, Bambang W.
Sieh, Kerry
format Article
author Feng, Lujia
Hill, Emma Mary
Banerjee, Paramesh
Hermawan, Iwan
Tsang, Louisa L. H.
Natawidjaja, Danny H.
Suwargadi, Bambang W.
Sieh, Kerry
author_sort Feng, Lujia
title A unified GPS-based earthquake catalog for the Sumatran plate boundary between 2002 and 2013
title_short A unified GPS-based earthquake catalog for the Sumatran plate boundary between 2002 and 2013
title_full A unified GPS-based earthquake catalog for the Sumatran plate boundary between 2002 and 2013
title_fullStr A unified GPS-based earthquake catalog for the Sumatran plate boundary between 2002 and 2013
title_full_unstemmed A unified GPS-based earthquake catalog for the Sumatran plate boundary between 2002 and 2013
title_sort unified gps-based earthquake catalog for the sumatran plate boundary between 2002 and 2013
publishDate 2015
url https://hdl.handle.net/10356/104650
http://hdl.handle.net/10220/25990
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