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2 results on '"Davide Scafidi"'

1. Current observations from a looking down vertical V-ADCP: interaction with winds and tide? The case of Giglio Island (Tyrrhenian Sea, Italy)

Author

Laura Cutroneo, Gabriele Ferretti, Davide Scafidi, Gian Domenico Ardizzone, Greta Vagge, and Marco Capello

Subjects
Currents, Wind interactions, Sea level, Normalised Cross-Correlation Function, Oceanography, GC1-1581
Abstract

In the context of the environmental monitoring of the Concordia wreck removal project, measurements of currents, winds and sea level height were made along the eastern coast of the Giglio Island, Tyrrhenian Sea (Italy), during 2012–2013. The aim of the study was to investigate the effect of atmospheric forcing and periodic sea-level changes on the coastal currents. Normalised Cross-Correlation Function analysis allowed us to correlate these observations. A marked inter-seasonal variability was found in both current and local wind velocity observations but a significant level of correlation between the data was only found during strong wind events. Current and wind directions appeared to be uncorrelated and current measurements showed a predominant NW–SE direction, presumably linked to the shape and orientation of Giglio Island itself. During strong winds from the SSE, current flow was towards the NNW but it suddenly switched from the NNW to the SE at the end of wind events. The results show that, at Giglio Island, currents are principally dominated by the general cyclonic Tyrrhenian circulation, and, secondly, by strong wind events. The sea level had no effects on the current regime.

Published
2017
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2. Earthquake relocations, crustal rheology, and active deformation in the central-eastern Alps (N Italy)

Author

Giorgio Ranalli, Davide Scafidi, Bruno Della Vedova, Daniele Spallarossa, Silvana Martin, Alfio Viganò, Viganò, Alfio, Scafidi, Davide, Ranalli, Giorgio, Martin, Silvana, DELLA VEDOVA, Bruno, and Spallarossa, Daniele

Subjects
geography, geography.geographical_feature_category, Adriatic crust, Earthquake relocations, Faults, Italian Alps, Rheology, Seismotectonic model, Earth-Surface Processes, Geophysics, Deformation (mechanics), Earthquake relocation, Crustal stress, Fault (geology), Geological structure, Fault, Strain partitioning, Upper crust, Compression (geology), Geology, Seismology
Abstract

A revised seismic catalogue (1994–2007) for the central–eastern Alps (N Italy) is presented. 396 earthquake relocations, for local magnitudes in the 1.2–5.3 range, are performed using a 3D crustal velocity structure and probabilistic locations. The location procedure is validated by computing a set of 41 quarry shot solutions and all the results, both about shots and seismic events, are compared with those obtained using the routine location procedure. Results are shown for five contiguous seismotectonic domains, as supported by geological and geophysical evidence (e.g., fault systems, crustal tomography, focal mechanisms types). Earthquake hypocentres are mostly located in the upper crust (0–15 km of depth), in good agreement with thermo-rheological models about the brittle–ductile transitions (8–9 km of depth) and total crustal strengths (1.0–2.0 TN m − 1 ). Epicentres are clustered and/or aligned along present-day active geological structures. The proposed seismotectonic model shows dominant compression along the Giudicarie and Belluno–Bassano–Montello thrusts, with strain partitioning along the dominant right-lateral strike-slip faults of the Schio–Vicenza domain. The present-day deformation of the Southern Alps and the internal Alpine chain is compatible with Adria indentation and the related crustal stress distribution.

Published
2015

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