eprintid: 1802 rev_number: 11 eprint_status: archive userid: 2 dir: disk0/00/00/18/02 datestamp: 2016-10-06 11:44:33 lastmod: 2017-02-08 12:21:35 status_changed: 2016-10-06 11:44:33 type: article metadata_visibility: show creators_name: Improta, Luigi creators_name: Valoroso, Luisa creators_name: Piccinini, Davide creators_name: Chiarabba, Claudio corp_creators: Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy corp_creators: Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy corp_creators: Istituto Nazionale di Geofisica e Vulcanologia, Pisa, Italy corp_creators: Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy title: A detailed analysis of wastewater-induced seismicity in the Val d'Agri oil field (Italy) subjects: MP2 subjects: RIt2 subjects: SHC divisions: IP6 full_text_status: none abstract: The Val d'Agri basin in the Apennines seismic belt hosts the largest oil field in onshore Europe. High-quality recordings from a temporary dense network unravel a swarm of 111 small-magnitude events (ML ≤ 1.8) occurred in June 2006 during the first stage of wastewater injection into a high-rate well. High-precision relative locations define a preexisting blind fault located 1 km below the well inside fractured and saturated carbonates where wastewater is reinjected. Seismicity begins 3 h after the initiation of injection. The seismicity rate strictly correlates with injection curves and temporal variations of elastic and anisotropic parameters. Seismicity is induced by rapid communication of pore pressure perturbations along a high-permeability fault zone favorably oriented with respect to the local extensional stress field. Our accurate 3-D locations of 219 events (ML ≤ 2.2) detected by the local operator network after June 2006 concentrate on the preexisting fault measuring 5 km along dip. Over the following 7.5 years, the seismicity rate correlates with short-term increases in injection pressure. date: 2015-04 date_type: published publication: Geophysical Research Letters volume: 42 number: 8 publisher: American Geophysical Union pagerange: 2682-2690 id_number: doi:10.1002/2015GL063369 issn: 0094-8276 official_url: http://doi.org/10.1002/2015GL063369 access_IS-EPOS: limited owner: Publisher citation: Improta, Luigi and Valoroso, Luisa and Piccinini, Davide and Chiarabba, Claudio (2015) A detailed analysis of wastewater-induced seismicity in the Val d'Agri oil field (Italy). Geophysical Research Letters, 42 (8). pp. 2682-2690. DOI: https://doi.org/10.1002/2015GL063369