GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 1.1 GNGTS 2023 Fig. 3: Comparison of the hydrological (TWS), geodetic (GNSS IC1) and seismic ( δ v/v) observations. Dashed green lines represent the 2016 seismic sequence of central Italy. The color scale of the seismic result represents a measure of the stability in the δ v/v result: it corresponds to the number of data (points) available during the regression process for every daily lapse-time sample. Conclusions We show the strong seasonal behaviour in our geodetic and seismic-noise results, and demonstrate the dominant role that variations of groundwater content play in governing temporal crustal deformation and seismic-velocity perturbations in this area. Geodetic observations succeed in isolating the hydrological component of the crustal deformation in the region, identifying the tectonic signals associated with local seismic events. Yet, our seismic results reveal that in order to study the pre- co- and post-seismic effects of the crustal mechanical properties in depth, an accurate estimation of the seismic perturbations due to hydrological changes must be previously accounted for. References Chiaraluce L., Amato A., Carannante S., Castelli V., Cattaneo M., Cocco M., Collettini C., D'Alema Ezio., Di Stefano R., Latorre D., and others.; 2014: The Alto Tiberina Near Fault Observatory (northern Apennines, Italy). Annals of Geophysics, 57 (3), S0327, DOI 10.4401/ag-6426. Clarke D., Zaccarelli L., Shapiro N.M., Brenguier, F.; 2011: Assessment of resolution and accuracy of the Moving Window Cross Spectral technique for monitoring crustal temporal variations using ambient seismic noise. Geophysical Journal International, 186 (2), 867--882, DOI 10.1111/j.1365-246X.2011.05074.x. Pintori, F., Serpelloni E., Longuevergne L., Garcia A., Faenza L., D'Alberto L., Gualandi A., Belardinelli M.E.; 2021: Mechanical response of shallow crust to groundwater storage variations: Inferences from deformation and seismic observations in the Eastern Southern Alps, Italy. Journal of Geophysical Research: Solid Earth, 126 (2), e2020JB020586, DOI 10.1029/2020JB020586. Serpelloni E., Pintori F., Gualandi A., Scoccimarro E., Cavaliere A., Anderlini L., Belardinelli M.E., Todesco M.; 2018: Hydrologically-induced karst deformation: Insights from {GPS} measurements in