The 14 November 2001 Kokoxili (Tibet) earthquake: High-frequency seismic radiation originating from the transitions between sub-Rayleigh and supershear rupture velocity regimes - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Journal of Geophysical Research : Solid Earth Année : 2008

The 14 November 2001 Kokoxili (Tibet) earthquake: High-frequency seismic radiation originating from the transitions between sub-Rayleigh and supershear rupture velocity regimes

Maxime Vallée
Nikolai M. Shapiro
Y Klinger

Résumé

Seismic array based analysis of the major Kokoxili earthquake (Tibet, 14 November 2001) yields an unambiguous reconstruction of the seismic rupture history and relates it to the generated seismic radiation. We demonstrate that after a classical sub-Rayleigh velocity stage, the rupture speed has jumped to supershear values close to compressional wave velocity over a 175-km-long fault segment, before abruptly slowing down in the late part of the earthquake. The transition locations between these three phases are correlated with the fault geometry and are associated with the most energetic radiation. This observation proves that the rupture velocity changes, as theoretically predicted, are a primary source of high-frequency seismic radiation. This result requires reconsidering the origins of seismic damage, generally attributed to slip variations.

Domaines

Tectonique
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Dates et versions

insu-01303866 , version 1 (18-04-2016)

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Maxime Vallée, M Landès, Nikolai M. Shapiro, Y Klinger. The 14 November 2001 Kokoxili (Tibet) earthquake: High-frequency seismic radiation originating from the transitions between sub-Rayleigh and supershear rupture velocity regimes. Journal of Geophysical Research : Solid Earth, 2008, 113 (B7), pp.B07305. ⟨10.1029/2007JB005520⟩. ⟨insu-01303866⟩
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