Publication Date:
2021-12-06
Description:
Volcanic islands are often affected by ground displacement such as slope instability, due
to their peculiar morphology. This is the case of Ischia Island (Naples, Italy) dominated by the Mt.
Epomeo (787 m a.s.l.), a volcano-tectonic horst located in the central portion of the island. This study
aims to follow a long temporal evolution of ground deformations on the island through the
interferometric analysis of satellite SAR data. Different datasets, acquired during Envisat, COSMOSkyMed
and Sentinel-1 satellite missions, are for the first time processed in order to obtain the island
ground deformations during a time interval spanning 17 years, from November 2002 to December
2019. In detail, the multitemporal differential interferometry technique, named small baseline
subset, is applied to produce the ground displacement maps and the associated displacement time
series. The results, validated through the analysis and the comparison with a set of GPS
measurements, show that the northwestern side of Mt. Epomeo is the sector of the island
characterized by the highest subsidence movements (maximum vertical displacement of 218 mm)
with velocities ranging from 10 to 20 mm/yr. Finally, the displacement time series allow us to
correlate the measured ground deformations with the seismic swarm started with the Mw 3.9
earthquake that occurred on 21 August 2017. Such correlations highlight an acceleration of the
ground, following the mainshock, characterized by a subsidence displacement rate of 0.12 mm/day
that returned to pre-earthquake levels (0.03 mm/day) after 6 months from the event.
Description:
Published
Description:
4253
Description:
7A. Geofisica per il monitoraggio ambientale
Description:
JCR Journal
Keywords:
InSAR; GPS; remote sensing; ground displacement; Ischia volcano; earthquake; slope instability
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
