Large extensional earthquakes push-up terrific amount of fluids.

ABSTRACT: How large earthquakes are triggered is a key question in Earth science, and the role played by fluid pressure seems to be crucial. Nevertheless, evaluation of involved fluid volumes is seldom investigated, if not unaccounted for. Moreover, fluid flow along fault zones is a driving factor for seismicity migration, episodic heat and chemical transport. Here we show that time repeated (4D) seismic tomography resolves changes of V_p and V_p/V_s during the Mw6.2 2009 L'Aquila normal faulting sequence, that indicate a post-failure fluid migration from hypocentral depths to the surface, with a volume estimated between 5 and 100 × 10⁶ m³ rising at rates up to 100 m/day. This amount inferred by tomograms is surprisingly consistent with the about 5

SUBMITTER: Chiarabba C 

PROVIDER: S-EPMC9418187 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature