Time-reversal imaging of seismic sources and application to the great Sumatra earthquake

The increasing power of computers and numerical methods (like spectral element methods) allows continuously improving modelization of the propagation of seismic waves in heterogeneous media and the development of new applications in particular time reversal in the three‐dimensional Earth. The concep...

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Bibliographic Details
Published in:Geophysical research letters 2006-10, Vol.33 (19), p.n/a
Main Authors: Larmat, Carene, Montagner, Jean-Paul, Fink, Mathias, Capdeville, Yann, Tourin, Arnaud, Clévédé, Eric
Format: Article
Language:English
Subjects:
Earth Sciences
Earth, ocean, space
Exact sciences and technology
Geophysics
Sciences of the Universe
Volcanology
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Summary:The increasing power of computers and numerical methods (like spectral element methods) allows continuously improving modelization of the propagation of seismic waves in heterogeneous media and the development of new applications in particular time reversal in the three‐dimensional Earth. The concept of time‐reversal (hereafter referred to as TR) was previously successfully applied for acoustic waves in many fields like medical imaging, underwater acoustics and non destructive testing. We present here the first application at the global scale of TR with associated reverse movies of seismic waves propagation by sending back long period time‐reversed seismograms. We show that seismic wave energy is refocused at the right location and the right time of the earthquake. When TR is applied to the Sumatra‐Andaman earthquake (26 Dec. 2004), the migration of the rupture from the south towards the north is retrieved. Therefore, TR is potentially interesting for constraining the spatio‐temporal history of complex earthquakes.
ISSN:0094-8276
1944-8007
DOI:10.1029/2006GL026336