dc.contributor.authorPhilibosian, Belle
dc.contributor.authorSieh, Kerry
dc.contributor.authorAvouac, Jean-Philippe
dc.contributor.authorNatawidjaja, Danny H.
dc.contributor.authorChiang, Hong-Wei
dc.contributor.authorWu, Chung-Che
dc.contributor.authorShen, Chuan-Chou
dc.contributor.authorDaryono, Mudrik R.
dc.contributor.authorPerfettini, Hugo
dc.contributor.authorSuwargadi, Bambang W.
dc.contributor.authorLu, Yanbin
dc.contributor.authorWang, Xianfeng
dc.date.accessioned2017-04-06T06:38:17Z
dc.date.available2017-04-06T06:38:17Z
dc.date.issued2016
dc.identifier.citationPhilibosian, B., Sieh, K., Avouac, J.-P., Natawidjaja, D. H., Chiang, H.-W., Wu, C.-C., et al. (2017). Earthquake supercycles on the Mentawai segment of the Sunda megathrust in the seventeenth century and earlier. Journal of Geophysical Research: Solid Earth, 122(1), 642-676.en_US
dc.identifier.issn2169-9313en_US
dc.identifier.urihttp://hdl.handle.net/10220/42234
dc.description.abstractOver at least the past millennium, the Mentawai segment of the Sunda megathrust has failed in sequences of closely timed events rather than in single end-to-end ruptures—each the culmination of an earthquake “supercycle.” Here we synthesize the sixteenth- and seventeenth-century coral microatoll records into a chronology of interseismic and coseismic vertical deformation. We identify at least five discrete uplift events in about 1597, 1613, 1631, 1658, and 1703 that likely correspond to large megathrust ruptures. This sequence contrasts with the following supercycle culmination, which involved only two large ruptures in 1797 and 1833. Fault slip modeling suggests that together the five cascading ruptures involved failure of the entire Mentawai segment. Interseismic deformation rates also changed after the onset of the rupture sequence, as they did after the 1797 earthquake. We model this change as an altered distribution of fault coupling, presumably triggered by the ~1597 rupture. We also analyze the far less continuous microatoll record between A.D. 1 and 1500. While we cannot confidently delineate the extent of any megathrust rupture during that period, all evidence suggests that individual major ruptures involve only part of the Mentawai segment, often overlap below the central Mentawai Islands, often trigger coupling changes, and occur in clusters that cumulatively cover the entire Mentawai segment at the culmination of each supercycle. It is clear that each Mentawai rupture sequence evolves uniquely in terms of the order and grouping of asperities that rupture, suggesting heterogeneities in fault frictional properties at the ~100 km scale.en_US
dc.description.sponsorshipNRF (Natl Research Foundation, S’pore)en_US
dc.description.sponsorshipMOE (Min. of Education, S’pore)en_US
dc.format.extent35 p.en_US
dc.language.isoenen_US
dc.relation.ispartofseriesJournal of Geophysical Research: Solid Earthen_US
dc.rights© 2016 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.en_US
dc.subjectEarthquake cyclesen_US
dc.subjectSunda megathrusten_US
dc.titleEarthquake supercycles on the Mentawai segment of the Sunda megathrust in the seventeenth century and earlieren_US
dc.typeJournal Article
dc.contributor.researchEarth Observatory of Singapore
dc.identifier.doihttp://dx.doi.org/10.1002/2016JB013560
dc.description.versionPublished versionen_US


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