{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,8]],"date-time":"2026-02-08T05:17:51Z","timestamp":1770527871350,"version":"3.49.0"},"reference-count":76,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2019,5,18]],"date-time":"2019-05-18T00:00:00Z","timestamp":1558137600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>After a month-long increase in activity at the summit craters, on 24 December 2018, the Etna volcano experienced a short-lived lateral effusive event followed by a rapid resumption of low-level explosive and degassing activity at the summit vents. By combining space (Moderate Resolution Imaging Spectroradiometer; MODIS and SENTINEL-2 images) and ground-based geophysical data, we track, in near real-time, the thermal, seismic and infrasonic changes associated with Etna\u2019s activity during the September\u2013December 2018 period. Satellite thermal data reveal that the fissural eruption was preceded by a persistent increase of summit activity, as reflected by overflow episodes in New SouthEast Crater (NSE) sector. This behavior is supported by infrasonic data, which recorded a constant increase both in the occurrence and in the energy of the strombolian activity at the same crater sectors mapped by satellite. The explosive activity trend is poorly constrained by the seismic tremor, which shows instead a sudden increase only since the 08:24 GMT on the 24 December 2018, almost concurrently with the end of the infrasonic detections occurred at 06:00 GMT. The arrays detected the resumption of infrasonic activity at 11:13 GMT of 24 December, when tremors almost reached the maximum amplitude. Infrasound indicates that the explosive activity was shifting from the summit crater along the flank of the Etna volcano, reflecting, with the seismic tremor, the intrusion of a gas-rich magma batch along a ~2.0 km long dyke, which reached the surface generating an intense explosive phase. The dyke propagation lasted for almost 3 h, during which magma migrated from the central conduit system to the lateral vent, at a mean speed of 0.15\u20130.20 m s\u22121. Based on MODIS and SENTINEL 2 images, we estimated that the summit outflows erupted a volume of lava of 1.4 Mm3 (\u00b10.5 Mm3), and that the lateral effusive episode erupted a minimum volume of 0.85 Mm3 (\u00b10.3 Mm3). The results presented here outline the support of satellite data on tracking the evolution of volcanic activity and the importance to integrate satellite with ground-based geophysical data in improving assessments of volcanic hazard during eruptive crises.<\/jats:p>","DOI":"10.3390\/rs11101182","type":"journal-article","created":{"date-parts":[[2019,5,20]],"date-time":"2019-05-20T11:05:07Z","timestamp":1558350307000},"page":"1182","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":44,"title":["Space- and Ground-Based Geophysical Data Tracking of Magma Migration in Shallow Feeding System of Mount Etna Volcano"],"prefix":"10.3390","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7866-3347","authenticated-orcid":false,"given":"Marco","family":"Laiolo","sequence":"first","affiliation":[{"name":"Dipartimento di Scienze della Terra, Universit\u00e0 di Torino, V. Valperga Caluso 4; 10125 Torino, Italy"}]},{"given":"Maurizio","family":"Ripepe","sequence":"additional","affiliation":[{"name":"Dipartimento di Scienze della Terra, Universit\u00e0 di Firenze, V. G. La Pira 4; 50121 Firenze, Italy"}]},{"given":"Corrado","family":"Cigolini","sequence":"additional","affiliation":[{"name":"Dipartimento di Scienze della Terra, Universit\u00e0 di Torino, V. Valperga Caluso 4; 10125 Torino, Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7181-4122","authenticated-orcid":false,"given":"Diego","family":"Coppola","sequence":"additional","affiliation":[{"name":"Dipartimento di Scienze della Terra, Universit\u00e0 di Torino, V. Valperga Caluso 4; 10125 Torino, Italy"}]},{"given":"Massimo","family":"Della Schiava","sequence":"additional","affiliation":[{"name":"Dipartimento di Scienze della Terra, Universit\u00e0 di Firenze, V. G. La Pira 4; 50121 Firenze, Italy"}]},{"given":"Riccardo","family":"Genco","sequence":"additional","affiliation":[{"name":"Dipartimento di Scienze della Terra, Universit\u00e0 di Firenze, V. G. La Pira 4; 50121 Firenze, Italy"}]},{"given":"Lorenzo","family":"Innocenti","sequence":"additional","affiliation":[{"name":"Dipartimento di Scienze della Terra, Universit\u00e0 di Firenze, V. G. La Pira 4; 50121 Firenze, Italy"}]},{"given":"Giorgio","family":"Lacanna","sequence":"additional","affiliation":[{"name":"Dipartimento di Scienze della Terra, Universit\u00e0 di Firenze, V. G. La Pira 4; 50121 Firenze, Italy"}]},{"given":"Emanuele","family":"Marchetti","sequence":"additional","affiliation":[{"name":"Dipartimento di Scienze della Terra, Universit\u00e0 di Firenze, V. G. La Pira 4; 50121 Firenze, Italy"}]},{"given":"Francesco","family":"Massimetti","sequence":"additional","affiliation":[{"name":"Dipartimento di Scienze della Terra, Universit\u00e0 di Torino, V. Valperga Caluso 4; 10125 Torino, Italy"},{"name":"Dipartimento di Scienze della Terra, Universit\u00e0 di Firenze, V. G. La Pira 4; 50121 Firenze, Italy"}]},{"given":"Maria Cristina","family":"Silengo","sequence":"additional","affiliation":[{"name":"Dipartimento di Scienze della Terra, Universit\u00e0 di Firenze, V. G. La Pira 4; 50121 Firenze, Italy"}]}],"member":"1968","published-online":{"date-parts":[[2019,5,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"52","DOI":"10.1007\/s00445-017-1134-8","article-title":"Predicting the end of lava flow-forming eruptions from space","volume":"79","author":"Bonny","year":"2017","journal-title":"Bull. Volcanol."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"277","DOI":"10.1144\/SP426.28","article-title":"On the detection and monitoring of effusive eruptions using satellite SO2 measurements","volume":"426","author":"Carn","year":"2016","journal-title":"Geol. Soc. Lond. Spec. 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