The 25 October 2010 Mentawai tsunami earthquake, from real-time discriminants, finite-fault rupture, and tsunami excitation
Geophysical Research Letters
By: A.V. Newman, G. Hayes, Y. Wei, and J. Convers
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Abstract
The moment magnitude 7.8 earthquake that struck offshore the Mentawai islands in western Indonesia on 25 October 2010 created a locally large tsunami that caused more than 400 human causalities. We identify this earthquake as a rare slow-source tsunami earthquake based on: 1) disproportionately large tsunami waves; 2) excessive rupture duration near 125 s; 3) predominantly shallow, near-trench slip determined through finite-fault modeling; and 4) deficiencies in energy-to-moment and energy-to-duration-cubed ratios, the latter in near-real time. We detail the real-time solutions that identified the slow-nature of this event, and evaluate how regional reductions in crustal rigidity along the shallow trench as determined by reduced rupture velocity contributed to increased slip, causing the 5-9 m local tsunami runup and observed transoceanic wave heights observed 1600 km to the southeast. Copyright 2011 by the American Geophysical Union.
Suggested Citation
Newman, A., Hayes, G., Wei, Y., and Convers, J., 2011, The 25 October 2010 Mentawai tsunami earthquake, from real-time discriminants, finite-fault rupture, and tsunami excitation: Geophysical Research Letters, v. 38, no. 5, https://doi.org/10.1029/2010GL046498.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | The 25 October 2010 Mentawai tsunami earthquake, from real-time discriminants, finite-fault rupture, and tsunami excitation |
| Series title | Geophysical Research Letters |
| DOI | 10.1029/2010GL046498 |
| Volume | 38 |
| Issue | 5 |
| Publication Date | March 05, 2011 |
| Year Published | 2011 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Geophysical Research Letters |