Publication Date:
2021-01-05
Description:
In December 2018, Etna volcano experienced one of the largest episodes of unrest since
the installation of geophysical monitoring networks in 1970. The unrest culminated in a short eruption
with a small volume of lava erupted, a significant seismic crisis and deformation of the entire volcanic
edifice of magnitude never recorded before at Mount Etna. Here we describe the evolution of the 2018
eruptive cycle from the analysis of seismic and geodetic data collected in the months preceding, during, and
following the intrusion. We model the space‐time evolution of high‐rate deformation data starting from
the active source previously identified from deformation data and the propagation of seismicity in a 3‐D
velocity model. The intrusion model suggests emplacement of two dikes: a smaller dike located beneath the
eruptive fissure and a second, deeper dike between 1 and 5 kmbelow sea level that opened ~2 m. The rise and
eruption of magma from the shallower dike did not interrupt the pressurization of a long‐lasting deeper
reservoir (~6 km) that induced continuous inflation and intense deformation of the eastern flank. Shortly
after the intrusion, on 26 December 2018, aML4.8 earthquake occurred near Pisano, destroying buildings and
roads in two villages. We propose a time‐dependent intrusion model that supports the hypothesis of the
inflation inducing flank deformation and that this process has been active since September 2018.
Description:
Published
Description:
e2020GC009218
Description:
2V. Struttura e sistema di alimentazione dei vulcani
Description:
JCR Journal
Keywords:
2018 Mount Etna Eruption, time‐dependent intrusion model, modelling of high‐rate deformations
;
04.08. Volcanology
;
04.03. Geodesy
;
04.06. Seismology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
