eprintid: 1710 rev_number: 15 eprint_status: archive userid: 6 dir: disk0/00/00/17/10 datestamp: 2016-09-15 11:04:39 lastmod: 2017-02-08 12:21:31 status_changed: 2016-09-15 11:04:39 type: article metadata_visibility: show creators_name: Amoroso, Ortensia creators_name: Ascione, Alessandra creators_name: Mazzoli, Stefano creators_name: Virieux, Jean creators_name: Zollo, Aldo corp_creators: Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuviano, Naples, Italy corp_creators: Department of Earth Sciences, Environment and Georesources (DiSTAR), University of Naples Federico II, Naples, Italy corp_creators: Department of Earth Sciences, Environment and Georesources (DiSTAR), University of Naples Federico II, Naples, Italy corp_creators: ISTerre, Université de Grenoble I, CNRS, Grenoble, France corp_creators: Department of Physics, University of Naples Federico II, Naples, Italy title: Seismic imaging of a fluid storage in the actively extending Apennine mountain belt, southern Italy subjects: MP2 subjects: RIt divisions: SHEER full_text_status: none abstract: A picture of the upper crustal structure of the Irpinia active faults system in southern Italy was obtained by combining new geological evidences, lithological properties, and microseismicity distribution. P and S wave velocity models indicate high VP/VS and low VP × VS values, suggesting fluid accumulation within a ~15 km wide rock volume where intense microseismicity is located. The 1980 Irpinia, Ms 6.9, earthquake nucleated within the same fault-bounded volume. We suggest that concentration of background seismicity is mainly controlled by high pore fluid pressure. Its increase in fluid-filled cracks around major faults leads to earthquakes' nucleation. Seismic pumping along major faults carries fluids through the conduit system represented by the intensely fractured damage zone. Conversely, the cross-fault barrier behaviour of the low-permeability fault core leads to pore fluid pressures building up within the fault-bounded block, thus producing a positive feedback triggering earthquake nucleation within the volume, which behaves as an “earthquake reservoir.” date: 2014-06 date_type: published publication: Geophysical Research Letters volume: 41 number: 11 publisher: American Geophysical Union pagerange: 3802-3809 id_number: doi:10.1002/2014GL060070 issn: 0094-8276 official_url: http://doi.org/10.1002/2014GL060070 access_IS-EPOS: limited owner: Publisher citation: Amoroso, Ortensia and Ascione, Alessandra and Mazzoli, Stefano and Virieux, Jean and Zollo, Aldo (2014) Seismic imaging of a fluid storage in the actively extending Apennine mountain belt, southern Italy. Geophysical Research Letters, 41 (11). pp. 3802-3809. DOI: https://doi.org/10.1002/2014GL060070