资源环境科技发展态势分析平台

We retrieve 3-D attenuation images of the crustal volume embedding the fault system associated with the destructive M-s 6.9, 1980 Irpinia earthquake by tomographic inversion of t* measurements. A high Q(P) anomaly is found to be correlated with the 1980 fault geometry, while the Q(S) model shows regional-scale variations related to the NE edge of the uplifted pre-Tertiary limestone. An upscaling 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 and CH4-CO2. The consolidation parameter range indicates high pore pressures at the 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.