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Caractérisation de la source sismique à partir des données en champ proche. Application aux séismes de Tottori (Japon) et Boumerdes (Algérie)

Abstract : The two earthquakes, which we chose to study in this thesis, are all the two produced on hidden and ignored faults. We used all the data available to specify the localization and the geometry of the faults having played at the time of the two earthquakes. The Tottori earthquake occurred on a strike-slip fault, the slip is superficial but no clear trace was observed on the surface. All the inversed models show a slip at the top of the fault thus contradicting the observations on the surface. We tested several models buried (compatible with the observations on the surface) at various depths. The results show that when the slip is authorized to occur close to surface, the agreement with the data is appreciably improved. These tests confirm that the slip occurred near to surface. The projection of the aftershocks on the fault plane shows that the distribution of the slip on the fault is controlled by a variation of the properties of the fault with the depth. The rupture during this earthquake seems to stop when meeting a perpendicular segment of fault. The same phenomenon (stopped rupture) is observed during the earthquake of Boumerdes. The localization of the fault of this event is possible due to GPS data. The position of fault suggested in this study, explains the observations well. The distribution of the slip on the fault after a two-step inversion shows that the rupture is bilateral with two zones of large slip. The calculation of the Coulomb stress variations shows a loading of the NW part of the Thénia fault, which is supposed to play a role in the stop of the rupture.
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https://tel.archives-ouvertes.fr/tel-00009839
Contributor : Fethi Semmane <>
Submitted on : Tuesday, July 26, 2005 - 2:51:55 PM
Last modification on : Thursday, November 19, 2020 - 3:54:28 PM
Long-term archiving on: : Friday, April 2, 2010 - 10:27:09 PM

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  • HAL Id : tel-00009839, version 1

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Fethi Semmane. Caractérisation de la source sismique à partir des données en champ proche. Application aux séismes de Tottori (Japon) et Boumerdes (Algérie). Géophysique [physics.geo-ph]. Université Joseph-Fourier - Grenoble I, 2005. Français. ⟨tel-00009839⟩

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