Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/80791
Title: Earthquake supercycles on the Mentawai segment of the Sunda megathrust in the seventeenth century and earlier
Authors: Philibosian, Belle
Sieh, Kerry
Avouac, Jean-Philippe
Natawidjaja, Danny H.
Chiang, Hong-Wei
Wu, Chung-Che
Shen, Chuan-Chou
Daryono, Mudrik R.
Perfettini, Hugo
Suwargadi, Bambang W.
Lu, Yanbin
Wang, Xianfeng
Keywords: Earthquake cycles
Sunda megathrust
Issue Date: 2016
Source: Philibosian, 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.
Series/Report no.: Journal of Geophysical Research: Solid Earth
Abstract: Over 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.
URI: https://hdl.handle.net/10356/80791
http://hdl.handle.net/10220/42234
ISSN: 2169-9313
DOI: 10.1002/2016JB013560
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.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EOS Journal Articles

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