Breaking the oceanic lithosphere of a subducting slab: the 2013 Khash, Iran earthquake
Geophysical Research Letters
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Abstract
[1] Large intermediate depth, intraslab normal faulting earthquakes are a common, dangerous, but poorly understood phenomenon in subduction zones owing to a paucity of near field geophysical observations. Seismological and high quality geodetic observations of the 2013 Mw7.7 Khash, Iran earthquake reveal that at least half of the oceanic lithosphere, including the mantle and entire crust, ruptured in a single earthquake, confirming with unprecedented resolution that large earthquakes can nucleate in and rupture through the oceanic mantle. A rupture width of at least 55 km is required to explain both InSAR observations and teleseismic waveforms, with the majority of slip occurring in the oceanic mantle. Combining our well-constrained earthquake slip distributions with the causative fault orientation and geometry of the local subduction zone, we hypothesize that the Khash earthquake likely occurred as the combined result of slab bending forces and dehydration of hydrous minerals along a preexisting fault formed prior to subduction.
Suggested Citation
Barnhart, W.D., Hayes, G.P., Samsonov, S., Fielding, E., Seidman, L., 2014, Breaking the oceanic lithosphere of a subducting slab: the 2013 Khash, Iran earthquake: Geophysical Research Letters, v. 41, no. 1, p. 32-36, https://doi.org/10.1002/2013GL058096.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Breaking the oceanic lithosphere of a subducting slab: the 2013 Khash, Iran earthquake |
| Series title | Geophysical Research Letters |
| DOI | 10.1002/2013GL058096 |
| Volume | 41 |
| Issue | 1 |
| Publication Date | January 08, 2014 |
| Year Published | 2014 |
| Language | English |
| Publisher | Wiley |
| Contributing office(s) | Geologic Hazards Science Center |
| Description | 5 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Geophysical Research Letters |
| First page | 32 |
| Last page | 36 |
| Country | Iran |