Larmat, Carène and Tromp, Jeroen and Liu, Qinya and Mantagner, Jean-Paul
(2008)
Time reversal location of glacial earthquakes.
Journal of Geophysical Research B, 113
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B09314.
ISSN 0148-0227.
doi:10.1029/2008JB005607.
https://resolver.caltech.edu/CaltechAUTHORS:LARjgrb08
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Abstract
In 2003, Ekström et al. reported the detection and location of a new class of earthquakes occurring in the polar regions of the Earth. The proposed source mechanism involves large and sudden sliding motions of glaciers, which gave the name “glacial earthquakes” to these events. In this study we localize some of these earthquakes with a time reversal mirror (TRM) algorithm, which, contrary to ordinary back projection methods, does not involve testing each possible source location. In TRM localization, an earthquake is located on the basis of only one 3-D spectral element simulation of seismic wave propagation by using the full complexity of recorded data as simultaneous time-reversed sources. We show that on the basis of this approach, even glacial earthquakes with a faint signal can be correctly localized and that the pattern of the time-reversed wavefield is coherent with the motion of glaciers down their valley.
Item Type: | Article |
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Additional Information: | Copyright 2008 by the American Geophysical Union.
Received 22 January 2008; accepted 22 July 2008; published 25 September 2008.
This work was partially funded by Institutional Support at Los Alamos and by the National Science Foundation under grant EAR-0309576. The data used in this study were provided by the IRIS Data Management Center. This is contribution 9000 of the Division of Geological and Planetary Sciences (GPS), California Institute of Technology. The numerical simulations for this research were performed on Caltech's GPS Division Dell cluster. |
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Funders: | Funding Agency | Grant Number |
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Los Alamos National Laboratory | UNSPECIFIED | National Science Foundation | EAR-0309576 |
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Subject Keywords: | glacial earthquakes; time-reversal imaging; source parameters |
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Other Numbering System: | Other Numbering System Name | Other Numbering System ID |
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Division of Geological and Planetary Sciences Contribution | 9000 |
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DOI: | 10.1029/2008JB005607 |
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Record Number: | CaltechAUTHORS:LARjgrb08 |
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Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:LARjgrb08 |
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Official Citation: | Larmat, C., J. Tromp, Q. Liu, and J.-P. Montagner (2008), Time reversal location of glacial earthquakes, J. Geophys. Res., 113, B09314, doi:10.1029/2008JB005607. |
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Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. |
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ID Code: | 12129 |
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Collection: | CaltechAUTHORS |
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Deposited By: |
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Deposited On: | 24 Oct 2008 21:20 |
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Last Modified: | 08 Nov 2021 22:25 |
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