Time reversal location of glacial earthquakes | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  Time reversal location of glacial earthquakes

Type de publication:

Journal Article

Source:

Journal of Geophysical Research-Solid Earth, Volume 113, Ticket B9 (2008)

ISBN:

0148-0227

Numéro d'accès:

WOS:000259608200001

Mots-clés:

Sismologie, UMR 7154

Résumé:

In 2003, Ekstrom 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.