资源环境科技发展态势分析平台

Two months after the 2016 Amatrice earthquake (AE), a strong (similar to M6) earthquake (Visso earthquake, VE) struck the town Visso, Italy, 20km north of the AE epicenter. Between these two events, the aftershocks migrated gradually toward to the VE epicenter at a rate of similar to 0.4 km/d, indicating propagation of pore pressure front. We use finite element models to simulate the postseismic fully coupled poroelastic response. The results show that the pore fluid flows (up to 50 nm/s) both horizontally and vertically into the VE hypocenter since the AE and destabilized the area with extra similar to 70% of Coulomb failure stress. Majority of nearby aftershocks (>80%) tend to cluster within the zones of coseismic depressurization where fluid flow converges. A maximum Delta CFS of similar to 35kPa is calculated at the VE hypocenter during its rupture by a crustal permeability, 10(-16 +/- 0.7) m(2), suggesting that an intermediately fractured crust allows maximum rupture tendency for the VE during poroelastic fluid recovery.