Publication Date:
2021-02-25
Description:
Central Apennines are one of the highest seismic risk regions in Italy. A number of energetic
events (MW 〉 5) struck the region during the period 2004–2017, killing several hundreds of
people (e.g., 294 casualties associated with the August 24th, 2016, MW 6.0 event of
Amatrice). These earthquakes impacted piezometric levels, springs discharges, and
groundwater chemistry across a large area, even at distances of dozens of kilometers
from the epicenters. Here we present a multidisciplinary dataset based on
hydrogeochemical and satellite observations associated with the seismic events that
occurred in Central Italy during the period 2004–2017, which combines information
derived from the application of groundwater monitoring and satellite techniques.
Groundwater monitoring techniques allowed for the detection of hydrogeochemical
anomalies in spring and well waters (14 water sampling points in total, with 22
variations larger than 2σ), while satellite techniques were applied to detect time-space
variations in ground thermal emissions. We detected two significant, almost synchronous,
anomalies in 2009 and 2016–2017 with both techniques, and we tentatively correlated
them to crustal deformation processes. Part of the observed signals were detected before
mainshocks, and they appear to be related to aseismic slip or to seismic slip eventually
induced by minor fluctuations in seismicity. We argue that the combination of two factors,
i.e., the shallow depth of local earthquakes and the concurrent deepening of groundwater
circulation paths to several km depth, allow for the recording of variations in the stress field
by geofluids released at the surface.
Description:
Published
Description:
584716
Description:
7T. Variazioni delle caratteristiche crostali e precursori sismici
Description:
JCR Journal
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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