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Time reversal location of glacial earthquakes

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 . B09314. ISSN 0148-0227. http://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
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2008JB005607DOIUNSPECIFIED
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.
Funders:
Funding AgencyGrant Number
Los Alamos National LaboratoryUNSPECIFIED
National Science FoundationEAR-0309576
Subject Keywords:glacial earthquakes; time-reversal imaging; source parameters
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Division of Geological and Planetary Sciences Contribution9000
Record Number:CaltechAUTHORS:LARjgrb08
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:LARjgrb08
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.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12129
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:24 Oct 2008 21:20
Last Modified:26 Mar 2014 01:34

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