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Geosciences 2018, 8(2), 62; https://doi.org/10.3390/geosciences8020062

Active Tectonics along the South East Offshore Margin of Mt. Etna: New Insights from High-Resolution Seismic Profiles

1
Dipartimento di Scienze Biologiche, Geologiche e Ambientali, University of Catania, Corso Italia, 57, 95129 Catania, Italy
2
Dipartimento di Scienze della Terra e del Mare (DISTEM), University of Palermo, Via Archirafi, 20/22, 90123 Palermo, Italy
*
Author to whom correspondence should be addressed.
Received: 6 December 2017 / Revised: 5 February 2018 / Accepted: 6 February 2018 / Published: 8 February 2018
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Abstract

The offshore margin of Mt. Etna has been shaped by Middle Pleistocene to Holocene shortening and extension and, more recently, by gravity-related sliding of the volcanic edifice. These processes have acted contemporaneously although the gravitational component largely prevails over the tectonic one. In order to investigate this issue, we focused on the main role of active tectonics along the south-eastern offshore of Mt. Etna by means of marine high-resolution seismic data. Seismic profiles revealed post-220 ka sedimentary deposits unconformably overlaying the Lower-Middle Pleistocene Etnean clayey substratum and volcanics of the Basal Tholeiitic phase and the Timpe phase. Offshore Aci Trezza-Catania, the architecture of the sedimentary deposits reflects syn-tectonic deposition occurred into “piggy-back” basin setting. Shortening rate was estimated at ~0.5 mm/a since ~220 ka. Asymmetric folding also involves post Last Glacial Maximum deposits, evidencing that compressional deformation is still active. In the continental slope, a belt of normal faults offset the Lower-Middle Pleistocene Etnean clayey substratum and younger deposits, also producing seafloor ruptures. Thrust and fold structures can be related to the recent migration of the Sicilian chain front, while extensional faults are interpreted as part of a major tectonic boundary located in the Ionian offshore of Sicily. View Full-Text
Keywords: Mt. Etna; seismic investigation; active tectonics; Sicilian thrust-belt; Ionian Sea Mt. Etna; seismic investigation; active tectonics; Sicilian thrust-belt; Ionian Sea
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Barreca, G.; Corradino, M.; Monaco, C.; Pepe, F. Active Tectonics along the South East Offshore Margin of Mt. Etna: New Insights from High-Resolution Seismic Profiles. Geosciences 2018, 8, 62.

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