eprintid: 2214 rev_number: 10 eprint_status: archive userid: 6 dir: disk0/00/00/22/14 datestamp: 2019-04-08 13:30:27 lastmod: 2019-04-08 13:30:27 status_changed: 2019-04-08 13:30:27 type: article metadata_visibility: show creators_name: Lengline, Olivier creators_name: Duputel, Z. creators_name: Ferrazzini, V. corp_creators: IPGS-EOST, Université de Strasbourg/CNRS, Strasbourg, France corp_creators: IPGS-EOST, Université de Strasbourg/CNRS, Strasbourg, France corp_creators: Observatoire Volcanologique du Piton de la Fournaise, Institut de Physique du Globe de Paris, La Réunion, France title: Uncovering the hidden signature of a magmatic recharge at Piton de la Fournaise volcano using small earthquakes subjects: MP1 divisions: EPOS-IP full_text_status: none abstract: We apply a template matching method to detect and locate preeruptive earthquakes at Piton de la Fournaise volcano in 2014 and 2015. This approach enabled the detection of many events and unveiled persistent seismicity features through multiple eruptions. Shallow earthquakes define a ring-shaped structure beneath the main crater. The repetitive occurrence of events along this structure suggests that it corresponds to a preexisting zone of weakness within the edifice. We also show evidence of deep magma transfer in 2015. More than 5000 deep earthquakes define an upward migration immediately followed by the occurrence of shallow events leading to an eruption 20 days later. This suggests the creation of a hydraulic connection between the lower part of the volcanic system and a magma reservoir located near sea level. We can envisage than such replenishments of the shallow reservoir occurred in the past but were undetected because of limited deep earthquake detections. date: 2016 date_type: published publication: Geophysical Research Letters volume: 43 number: 9 publisher: Geophysical Research Letters pagerange: 4255-4262 id_number: doi:10.1002/2016GL068383 issn: 00948276 official_url: http://doi.org/10.1002/2016GL068383 access_IS-EPOS: limited software_references: Template-Matching_based_Detection_Algorithm owner: Publisher citation: Lengline, Olivier and Duputel, Z. and Ferrazzini, V. (2016) Uncovering the hidden signature of a magmatic recharge at Piton de la Fournaise volcano using small earthquakes. Geophysical Research Letters, 43 (9). pp. 4255-4262. DOI: https://doi.org/10.1002/2016GL068383