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Persistent termini of 2004- and 2005-like ruptures of the Sunda megathrust

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Persistent termini of 2004- and 2005-like ruptures of the Sunda megathrust

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dc.contributor.author Meltzner, Aron J.
dc.contributor.author Sieh, Kerry
dc.contributor.author Chiang, Hong-Wei
dc.contributor.author Shen, Chuan-Chou
dc.contributor.author Suwargadi, Bambang W.
dc.contributor.author Natawidjaja, Danny H.
dc.contributor.author Philibosian, Belle
dc.contributor.author Briggs, Richard W.
dc.date.accessioned 2012-09-11T01:11:20Z
dc.date.available 2012-09-11T01:11:20Z
dc.date.copyright 2012
dc.date.issued 2012-09-11
dc.identifier.citation Meltzner, A. J., Sieh, K., Chiang, H. W., Shen, C. C., Suwargadi, B. W., Natawidjaja, D. H., et al. (2012). Persistent termini of 2004- and 2005-like ruptures of the Sunda megathrust. Journal of Geophysical Research, 117, B04405-.
dc.identifier.issn 0148-0227
dc.identifier.uri http://hdl.handle.net/10220/8486
dc.description.abstract To gain insight into the longevity of subduction zone segmentation, we use coral microatolls to examine an 1100-year record of large earthquakes across the boundary of the great 2004 and 2005 Sunda megathrust ruptures. Simeulue, a 100-km-long island off the west coast of northern Sumatra, Indonesia, straddles this boundary: northern Simeulue was uplifted in the 2004 earthquake, whereas southern Simeulue rose in 2005. Northern Simeulue corals reveal that predecessors of the 2004 earthquake occurred in the 10th century AD, in AD 1394±2, and in AD 1450±3. Corals from southern Simeulue indicate that none of the major uplifts inferred on northern Simeulue in the past 1100 years extended to southern Simeulue. The two largest uplifts recognized at a south-central Simeulue site—around AD 1422 and in 2005—involved little or no uplift of northern Simeulue. The distribution of uplift and strong shaking during a historical earthquake in 1861 suggests the 1861 rupture area was also restricted to south of central Simeulue, as in 2005. The strikingly different histories of the two adjacent patches demonstrate that this boundary has persisted as an impediment to rupture through at least seven earthquakes in the past 1100 years. This implies that the rupture lengths, and hence sizes, of at least some future great earthquakes and tsunamis can be forecast. These microatolls also provide insight into megathrust behavior between earthquakes, revealing sudden and substantial changes in interseismic strain accumulation rates.
dc.language.iso en
dc.relation.ispartofseries Journal of geophysical research
dc.rights © 2012 the American Geophysical Union. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of Geophysical Research, the American Geophysical Union. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: http://dx.doi.org/10.1029/2011JB008888.
dc.subject DRNTU::Science::Geology::Volcanoes and earthquakes
dc.title Persistent termini of 2004- and 2005-like ruptures of the Sunda megathrust
dc.type Journal Article
dc.identifier.doi http://dx.doi.org/10.1029/2011JB008888
dc.description.version Published version

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