Mw 8.6 Sumatran earthquake of 11 April 2012: rare seaward expression of oblique subduction
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Abstract
The magnitude 8.6 and 8.2 earthquakes off northwestern Sumatra on 11 April 2012 generated small tsunami waves that were recorded by stations around the Indian Ocean. Combining differential travel-time modeling of tsunami waves with results from back projection of seismic data reveals a complex source with a significant trench-parallel component. The oblique plate convergence indicates that ~20-50 m of trench-parallel displacement could have accumulated since the last megathrust earthquake, only part of which has been taken up by the Great Sumatran fault. This suggests that the remaining trench-parallel motion was released during the magnitude 8.6 earthquake on 11 April 2012 within the subducting plate. The magnitude 8.6 earthquake is interpreted to be a result of oblique subduction as well as a reduction in normal stress due to the occurrence of the Sumatra-Andaman earthquake in 2004.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Mw 8.6 Sumatran earthquake of 11 April 2012: rare seaward expression of oblique subduction |
| Series title | Geology |
| DOI | 10.1130/G33783.1 |
| Volume | 41 |
| Issue | 3 |
| Year Published | 2013 |
| Language | English |
| Publisher | Geological Society of America |
| Publisher location | Boulder, CO |
| Contributing office(s) | Pacific Coastal and Marine Science Center |
| Description | 4 p. |
| First page | 319 |
| Last page | 322 |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |