In-situ Study of Hydromechanical Interactions between Fluids and Active Fault - Application to the Corinth Rift Laboratory
Etude in-situ des interactions hydromécanique entre fluides et failles actives - Application au Laboratoire du Rift du Corinthe
Résumé
In order to assert in-situ the coupling between the fluid pressures and fault mechanics, a geodynamical laboratory was installed in the Corinth Rift. The prominent element of this European project is a borehole crossing the Aigio fault (which moved during a magnitude
6.2 earthquake in 1995), and its permanent instrumentation which
enables the continuous recording of fluid pressure around the fault. We first characterized the hydrogeological environment with methods arising both from geothermics and hydrogeology. It then becomes possible to interpret the multiple hydraulic anomalies recorded by our high precision sensors. Their abundance is a testimony to the activity of the fault.
6.2 earthquake in 1995), and its permanent instrumentation which
enables the continuous recording of fluid pressure around the fault. We first characterized the hydrogeological environment with methods arising both from geothermics and hydrogeology. It then becomes possible to interpret the multiple hydraulic anomalies recorded by our high precision sensors. Their abundance is a testimony to the activity of the fault.
Afin d'appréhender in-situ le couplage entre les pressions de fluides et la mécanique des failles, un laboratoire géodynamique a été installé dans le Rift de Corinthe. L'élément majeur de ce projet européen est un forage recoupant la faille d'Aigion, qui a rejoué lors d'un séisme de magnitude 6.2 en 1995, et son instrumentation permanente qui permet le suivi en continu de la pression de fluide autour de la faille. Nous avons d'abord caractérisé l'environnement hydrogéologique par la conjonction de méthodes relevant de la thermique et de l'hydrogéologie. Il devient alors possible d'interpréter les multiples anomalies hydrauliques perçues par nos capteurs de haute précision. Leur abondance témoigne de l'activité de la faille.
Domaines
Géophysique [physics.geo-ph]
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