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Source parameters of the great Sumatran megathrust earthquakes of 1797 and 1833 inferred from coral microatolls

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Source parameters of the great Sumatran megathrust earthquakes of 1797 and 1833 inferred from coral microatolls

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dc.contributor.author Natawidjaja, Danny H.
dc.contributor.author Sieh, Kerry
dc.contributor.author Chlieh, Mohamed
dc.contributor.author Galetzka, John
dc.contributor.author Suwargadi, Bambang W.
dc.contributor.author Cheng, Hai
dc.contributor.author Edwards, R. Lawrence
dc.contributor.author Avouac, Jean-Philippe
dc.contributor.author Ward, Steven N.
dc.date.accessioned 2012-09-06T07:18:18Z
dc.date.available 2012-09-06T07:18:18Z
dc.date.copyright 2006
dc.date.issued 2012-09-06
dc.identifier.citation Natawidjaja, D. H., Sieh, K., Chlieh, M., Galetzka, J., Suwargadi, B. W., Cheng, H., et al. (2006). Source parameters of the great Sumatran megathrust earthquakes of 1797 and 1833 inferred from coral microatolls. Journal of Geophysical Research, 111.
dc.identifier.issn 0148–0227
dc.identifier.uri http://hdl.handle.net/10220/8480
dc.description.abstract Large uplifts and tilts occurred on the Sumatran outer arc islands between 0.5° and 3.3°S during great historical earthquakes in 1797 and 1833, as judged from relative sea level changes recorded by annually banded coral heads. Coral data for these two earthquakes are most complete along a 160-km length of the Mentawai islands between 3.2° and 2°S. Uplift there was as great as 0.8 m in 1797 and 2.8 m in 1833. Uplift in 1797 extended 370 km, between 3.2° and 0.5°S. The pattern and magnitude of uplift imply megathrust ruptures corresponding to moment magnitudes (Mw) in the range 8.5 to 8.7. The region of uplift in 1833 ranges from 2° to at least 3.2°S and, judging from historical reports of shaking and tsunamis, perhaps as far as 5°S. The patterns and magnitude of uplift and tilt in 1833 are similar to those experienced farther north, between 0.5° and 3°N, during the giant Nias-Simeulue megathrust earthquake of 2005; the outer arc islands rose as much as 3 m and tilted toward the mainland. Elastic dislocation forward modeling of the coral data yields megathrust ruptures with moment magnitudes ranging from 8.6 to 8.9. Sparse accounts at Padang, along the mainland west coast at latitude 1°S, imply tsunami runups of at least 5 m in 1797 and 3–4 m in 1833. Tsunamis simulated from the pattern of coral uplift are roughly consistent with these reports. The tsunami modeling further indicates that the Indian Ocean tsunamis of both 1797 and 1833, unlike that of 2004, were directed mainly south of the Indian subcontinent. Between about 0.7° and 2.1°S, the lack of vintage 1797 and 1833 coral heads in the intertidal zone demonstrates that interseismic submergence has now nearly equals coseismic emergence that accompanied those earthquakes. The interseismic strains accumulated along this reach of the megathrust have thus approached or exceeded the levels relieved in 1797 and 1833.
dc.format.extent 37 p.
dc.language.iso en
dc.relation.ispartofseries Journal of geophysical research
dc.rights © 2006 American Geophysical Union. This paper was published in Journal of Geophysical Research and is made available as an electronic reprint (preprint) with permission of American Geophysical Union. The paper can be found at the following official URL: http://dx.doi.org/10.1029/2005JB004025. 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.
dc.subject DRNTU::Science::Geology::Volcanoes and earthquakes
dc.title Source parameters of the great Sumatran megathrust earthquakes of 1797 and 1833 inferred from coral microatolls
dc.type Journal Article
dc.identifier.doi http://dx.doi.org/10.1029/2005JB004025
dc.description.version Published version

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