Inversion de séismes par approximation elliptique : application au séisme de Tottori

Abstract : We develop an elliptical approximation method of the seismic source to improve the efficiency of both kinematic and dynamic inversions. We apply it to the 2000 Tottori Japan earthquake.
A non-linear kinematic inversion is first computed with the neighbourhood algorithm (NA). It converges on a slip distribution modeled by two elliptical patches and reproduces very well the strong motion records. The solution is non-unique.
We then apply the method to dynamic inversions. The dynamic rupture propagation is modeled with a finite difference method and the friction law is of the slip weakening type. We compute a trial and error dynamic inversion for both the asperity and the barrier models. The latter is easier to implement and matches better the observed records. The computed seismic moment is compatible with the magnitude of the Tottori earthquake and the fracture energy is similar to that estimated by other studies.
The dynamic inversion is implemented with the NA for the barrier model. The results correspond to a better fit of the observed data and illustrate the non-unicity of the dynamic solution.
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https://tel.archives-ouvertes.fr/tel-00325309
Contributor : Sara Di Carli <>
Submitted on : Sunday, September 28, 2008 - 4:34:29 PM
Last modification on : Friday, April 5, 2019 - 8:11:33 PM
Long-term archiving on : Thursday, June 3, 2010 - 8:10:53 PM

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  • HAL Id : tel-00325309, version 1

Citation

Sara Di Carli. Inversion de séismes par approximation elliptique : application au séisme de Tottori. Géophysique [physics.geo-ph]. Université Pierre et Marie Curie - Paris VI, 2008. Français. ⟨tel-00325309⟩

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