Eric Clévédé

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At periods greater than 1000 seconds, Earth's seismic free oscillations have anomalously large amplitude when referenced to the Harvard Centroid Moment Tensor fault mechanism, which is estimated from 300- to 500-second surface waves. By using more realistic rupture models on a steeper fault derived from seismic body and surface waves, we approximated free(More)
We investigate the impact of the theoretical limitations brought by asymptotic methods on upper-mantle tomographic Ž . models deduced from long-period surface wave data period )80 s , by performing a synthetic test using a non-asymptotic formalism. This methodology incorporates the effects of back and multiple forward scattering on the wave field by summing(More)
[1] 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(More)
Progress in determining the details of the global 3-D seismic velocity structure requires the ability to accurately model Ž . seismic wave propagation e.g., travel times, waveforms, etc. through heterogeneous 3-D Earth models. While for Ž . spherically symmetric models quasianalytical solutions are available for the verification of numerical algorithms,(More)
Transient gravity changes are expected to occur at all distances during an earthquake rupture, even before the arrival of seismic waves. Here we report on the search of such a prompt gravity signal in data recorded by a superconducting gravimeter and broadband seismometers during the 2011 Mw 9.0 Tohoku-Oki earthquake. During the earthquake rupture, a signal(More)
J.-P. Montagner,1 C. Larmat,2 Y. Capdeville,1 M. Fink,3 H. Phung,1 B. Romanowicz,4 E. Clévédé1 and H. Kawakatsu5 1Seismology Laboratory, Institut de Physique du Globe UMR-CNRS 7154, 1 rue Jussieu 75238 Paris Cedex 05, France. E-mail: 2L.A.N.L., Los Alamos, NM, USA 3Institut Langevin, ESPCI ParisTech, CNRS, 1 rue Jussieu, 75005 Paris, France(More)
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