000005853 001__ 5853
000005853 005__ 20241203110410.0
000005853 0247_ $$2DOI$$a10.1029/2022JB025024
000005853 037__ $$aSCART-2022-0098
000005853 100__ $$aBüyükakpınar, P.
000005853 245__ $$aChronicle of processes leading to the 2018 eruption at Mt. Etna as inferred by seismic ambient noise along with geophysical and geochemical observables.
000005853 260__ $$c2022
000005853 520__ $$aThis work analyzes temporal variations of seismic velocities at Mt. Etna from August 2018 to February 2019. During this time period, a strong flank eruption accompanied by intense seismicity and ground deformation took place along a fracture that opened on 24 December 2018 at the base of the New South-East summit crater. Furthermore, two moderate earthquakes—the 6 October 2018 ML 4.7 and 26 December 2018 ML 4.8—associated with the volcanic activity were recorded. In this study, we computed cross-correlation functions (CCFs) between windows of seismic ambient noise to identify seismic velocity variations within the volcano edifice. We calculated daily CCFs at 16 stations for 120 interstation pairs using the vertical component in the 1.0–1.5 Hz frequency band. We observe that dv/v starts to decrease rapidly from the beginning of October 2018 and reaches approximately −0.45% in the pre-eruption period. The spatio-temporal distribution of seismic velocities shows that the reduction of dv/v mostly occurs in the vicinity of the summit and close to the flank area and is interpreted to be affected by magmatic intrusion at 0–3 km depth. To infer the source mechanism of this eruption, we compared these observations with volcano-tectonic earthquakes, volcanic tremor, volcanic degassing, gravity, and ground deformation data. Our study suggests that a relationship between magma intrusion and associated crack opening is responsible for the decrease of dv/v.
000005853 536__ $$aDPC-INGVAllegatoB22019-2021-Task10/$$cDPC-INGVAllegatoB22019-2021-Task10/$$fDPC-INGVAllegatoB22019-2021-Task10
000005853 594__ $$aNO
000005853 6531_ $$aseismology
000005853 6531_ $$avolcanology
000005853 6531_ $$aeruption
000005853 6531_ $$avolcano-seismology
000005853 6531_ $$aEtna
000005853 6531_ $$aGravimetry
000005853 6531_ $$aGeochemistry
000005853 700__ $$aCannata, A.
000005853 700__ $$aCannavò, F.
000005853 700__ $$aCarbone, D.
000005853 700__ $$aDe Plaen, R.S.M.
000005853 700__ $$aDi Grazia, G.
000005853 700__ $$aKing, T.
000005853 700__ $$aLecocq, T.
000005853 700__ $$aLiuzzo, M.
000005853 700__ $$aSalerno, G.
000005853 773__ $$pJournal of Geophysical Research: Solid Earth$$y2022
000005853 85642 $$ahttps://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022JB025024
000005853 8560_ $$fthomas.lecocq@observatoire.be
000005853 8564_ $$s533468$$uhttps://publi2-as.oma.be/record/5853/files/jgrb55894-fig-0002-m.jpg$$y(a) Average velocity variation of 5-day moving window (dv/v) for all station pairs with its uncertainty (gray error bars). (b) Root Mean Square amplitude of volcanic tremor in velocity (m/s) filtered in the frequency band 0.5–2.5 Hz. (c) Gravity signal observed at SLN station (iGrav#16). (d) Normalized CO2 flux from the volcano flanks, measured by the EtnaGAS network. (e) The SO2 flux measured via FLAME network. (f) The areal strain of the summit area calculated using the EPLU, EPDN, ECPN, and EINT GNSS stations. The vertical dashed red lines show the 23 August Strombolian and 24 December eruption. The dashed green lines indicate the 6 October 2018 ML 4.7 and 26 December 2018 ML 4.8 earthquakes.
000005853 8564_ $$s11619$$uhttps://publi2-as.oma.be/record/5853/files/jgrb55894-fig-0002-m.gif?subformat=icon$$xicon$$y(a) Average velocity variation of 5-day moving window (dv/v) for all station pairs with its uncertainty (gray error bars). (b) Root Mean Square amplitude of volcanic tremor in velocity (m/s) filtered in the frequency band 0.5–2.5 Hz. (c) Gravity signal observed at SLN station (iGrav#16). (d) Normalized CO2 flux from the volcano flanks, measured by the EtnaGAS network. (e) The SO2 flux measured via FLAME network. (f) The areal strain of the summit area calculated using the EPLU, EPDN, ECPN, and EINT GNSS stations. The vertical dashed red lines show the 23 August Strombolian and 24 December eruption. The dashed green lines indicate the 6 October 2018 ML 4.7 and 26 December 2018 ML 4.8 earthquakes.
000005853 8564_ $$s16077$$uhttps://publi2-as.oma.be/record/5853/files/jgrb55894-fig-0002-m.jpg?subformat=icon-180$$xicon-180$$y(a) Average velocity variation of 5-day moving window (dv/v) for all station pairs with its uncertainty (gray error bars). (b) Root Mean Square amplitude of volcanic tremor in velocity (m/s) filtered in the frequency band 0.5–2.5 Hz. (c) Gravity signal observed at SLN station (iGrav#16). (d) Normalized CO2 flux from the volcano flanks, measured by the EtnaGAS network. (e) The SO2 flux measured via FLAME network. (f) The areal strain of the summit area calculated using the EPLU, EPDN, ECPN, and EINT GNSS stations. The vertical dashed red lines show the 23 August Strombolian and 24 December eruption. The dashed green lines indicate the 6 October 2018 ML 4.7 and 26 December 2018 ML 4.8 earthquakes.
000005853 905__ $$apublished in
000005853 980__ $$aREFERD