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The 25 October 2010 Mentawai tsunami earthquake (M_w 7.8) and the tsunami hazard presented by shallow megathrust ruptures

Lay, T. and Ammon, C. J. and Kanamori, H. and Yamazaki, Y. and Cheung, K. F. and Hutko, A. R. (2011) The 25 October 2010 Mentawai tsunami earthquake (M_w 7.8) and the tsunami hazard presented by shallow megathrust ruptures. Geophysical Research Letters, 38 (6). Art. No. L06302 . ISSN 0094-8276. https://resolver.caltech.edu/CaltechAUTHORS:20110414-100836919

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Abstract

The 25 October 2010 Mentawai, Indonesia earthquake (M_w 7.8) ruptured the shallow portion of the subduction zone seaward of the Mentawai islands, off-shore of Sumatra, generating 3 to 9 m tsunami run-up along southwestern coasts of the Pagai Islands that took at least 431 lives. Analyses of teleseismic P, SH and Rayleigh waves for finite-fault source rupture characteristics indicate ∼90 s rupture duration with a low rupture velocity of ∼1.5 km/s on the 10° dipping megathrust, with total slip of 2–4 m over an ∼100 km long source region. The seismic moment-scaled energy release is 1.4 × 10^(−6), lower than 2.4 × 10^(−6) found for the 17 July 2006 Java tsunami earthquake (M_w 7.8). The Mentawai event ruptured up-dip of the slip region of the 12 September 2007 Kepulauan earthquake (M_w 7.9), and together with the 4 January 1907 (M 7.6) tsunami earthquake located seaward of Simeulue Island to the northwest along the arc, demonstrates the significant tsunami generation potential for shallow megathrust ruptures in regions up-dip of great underthrusting events in Indonesia and elsewhere.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2010GL046552DOIArticle
ORCID:
AuthorORCID
Lay, T.0000-0003-2360-4213
Kanamori, H.0000-0001-8219-9428
Cheung, K. F.0000-0002-7435-0500
Additional Information:© 2011 American Geophysical Union. Received 20 December 2010; accepted 15 February 2011; published 22 March 2011. This work made use of GMT and SAC software. The IRIS DMS and the F‐Net data centers were used to access the data. We thank Kenji Satake for information about the tsunami run‐up observations on Mentawai. E. Geist and two anonymous reviewers provided very helpful comments on the manuscript. This work was supported by NSF grant EAR0635570 and USGS Award Number 05HQGR0174. The Editor thanks Eric Geist and two anonymous reviewers for their assistance in evaluating this paper.
Funders:
Funding AgencyGrant Number
NSFEAR-0635570
USGS05HQGR0174
Subject Keywords:tsunami earthquake; Mentawai; earthquake
Issue or Number:6
Record Number:CaltechAUTHORS:20110414-100836919
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20110414-100836919
Official Citation:Lay, T., C. J. Ammon, H. Kanamori, Y. Yamazaki, K. F. Cheung, and A. R. Hutko (2011), The 25 October 2010 Mentawai tsunami earthquake (Mw 7.8) and the tsunami hazard presented by shallow megathrust ruptures, Geophys. Res. Lett., 38, L06302, doi:10.1029/2010GL046552
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23333
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:14 Apr 2011 21:36
Last Modified:03 Oct 2019 02:45

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