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

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

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3319312l&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 19, CiteID L19312

Statistics

Computation

19

Seismology: Earthquake Dynamics (1242), Seismology: Earthquake Source Observations (1240), Seismology: Computational Seismology, General Or Miscellaneous: Techniques Applicable In Three Or More Fields

Scientific paper

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.

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