We retrieve 3-D attenuation images of the crustal volume embedding the fault system associated with the destructive Ms 6.9, 1980 Irpinia earthquake by tomographic inversion of t* measurements. A high-QP anomaly is found to be correlated with the 1980 fault geometry while the QS model shows regional-scale variations related to the NE edge of the uplifted pre-Tertiary limestone. An up-scaling strategy is used to infer rock properties such as porosity, consolidation, type of fluid mixing and relative saturation percentage at 8-10 km fault depth. We constrain the porosity and consolidation in the ranges 4-5% and 5-9, respectively with the possible fluid mixes being both brine-CO2 or CH4-CO2. The consolidation parameter range indicates high pore pressures at same depths. These results support the evidence for a fracture system, highly saturated in gases and a seismicity triggering mechanism at the fault zone, which is strongly controlled by fluid-induced pore pressure changes.

From Velocity and Attenuation Tomographies to Rock Physical Modeling: Inferences on fluid-driven earthquake processes at the Irpinia fault system in Southern Italy / Amoroso, Ortensia; Russo, Guido; De Landro, G.; Zollo, Aldo; Garambois, S.; Mazzoli, Stefano; Parente, Mariano; Virieux, Jean. - In: GEOPHYSICAL RESEARCH LETTERS. - ISSN 0094-8276. - 44:13(2017), pp. 6752-6760. [10.1002/2016GL072346]

From Velocity and Attenuation Tomographies to Rock Physical Modeling: Inferences on fluid-driven earthquake processes at the Irpinia fault system in Southern Italy

Amoroso, Ortensia;RUSSO, GUIDO;De Landro, G.;ZOLLO, ALDO;MAZZOLI, STEFANO;PARENTE, MARIANO;VIRIEUX, JEAN
2017

Abstract

We retrieve 3-D attenuation images of the crustal volume embedding the fault system associated with the destructive Ms 6.9, 1980 Irpinia earthquake by tomographic inversion of t* measurements. A high-QP anomaly is found to be correlated with the 1980 fault geometry while the QS model shows regional-scale variations related to the NE edge of the uplifted pre-Tertiary limestone. An up-scaling strategy is used to infer rock properties such as porosity, consolidation, type of fluid mixing and relative saturation percentage at 8-10 km fault depth. We constrain the porosity and consolidation in the ranges 4-5% and 5-9, respectively with the possible fluid mixes being both brine-CO2 or CH4-CO2. The consolidation parameter range indicates high pore pressures at same depths. These results support the evidence for a fracture system, highly saturated in gases and a seismicity triggering mechanism at the fault zone, which is strongly controlled by fluid-induced pore pressure changes.
2017
From Velocity and Attenuation Tomographies to Rock Physical Modeling: Inferences on fluid-driven earthquake processes at the Irpinia fault system in Southern Italy / Amoroso, Ortensia; Russo, Guido; De Landro, G.; Zollo, Aldo; Garambois, S.; Mazzoli, Stefano; Parente, Mariano; Virieux, Jean. - In: GEOPHYSICAL RESEARCH LETTERS. - ISSN 0094-8276. - 44:13(2017), pp. 6752-6760. [10.1002/2016GL072346]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/677872
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