scholarly journals Open-slope, translational submarine landslide in a tectonically active volcanic continental margin (Licosa submarine landslide, southern Tyrrhenian Sea)

2018 ◽  
Vol 477 (1) ◽  
pp. 133-150 ◽  
Author(s):  
M. Sammartini ◽  
A. Camerlenghi ◽  
F. Budillon ◽  
D. D. Insinga ◽  
F. Zgur ◽  
...  
Keyword(s):  
Slope Stability ◽  
Continental Margin ◽  
Submarine Landslide ◽  
Tyrrhenian Sea ◽  
Structural Discontinuity ◽  
Tectonically Active ◽  
Southern Tyrrhenian Sea ◽  
Multichannel Seismics ◽  
Back Arc ◽  
Detachment Surface

AbstractThe southern Tyrrhenian continental margin is the product of Pliocene–Recent back-arc extension. An area of approximately 30 km2 of gentle (about 1.5°) lower slope of the last glacial outer shelf sedimentary wedge in water depths of between 200 and 300 m failed between 14 and 11 ka BP. We approached the landslide by multibeam and sub-bottom profiler surveying, high-resolution multichannel seismics, and coring for stratigraphic and geotechnical purposes. With regard to a slope-stability analysis, we carried out an assessment of the stratigraphic and structural setting of the area of the Licosa landslide. This analysis revealed that the landslide detached along a marker bed that was composed of the tephra layer Y-5 (c. 39 ka). Several previously unknown geological characteristics of the area are likely to have affected the slope stability. These are the basal erosion of the slope in the Licosa Channel, a high sedimentation rate in the sedimentary wedge, earthquake shaking, the volcanic ash nature of the detachment surface, subsurface gas/fluid migration, and lateral porewater flow from the depocentre of wedge to the base of the slope along the high-permeability ash layers. A newly discovered prominent structural discontinuity is identified as the fault whose activity may have triggered the landslide.

scholarly journals Gravity instabilities in the Dohrn Canyon (Bay of Naples, Southern Tyrrhenian Sea): potential wave and run-up (tsunami) reconstruction from a fossil submarine landslide

2011 ◽  
Vol 62 (1) ◽  
pp. 55-63 ◽  
Author(s):  
Vincenzo di Fiore ◽  
Gemma Aiello ◽  
Bruno D'Argenio
Keyword(s):  
Submarine Landslide ◽  
Tyrrhenian Sea ◽  
Submarine Landslides ◽  
Recent Past ◽  
Sea Floor ◽  
Potential Wave ◽  
Phlegrean Fields ◽  
Sea Bottom ◽  
Southern Tyrrhenian Sea ◽  
Run Up

Gravity instabilities in the Dohrn Canyon (Bay of Naples, Southern Tyrrhenian Sea): potential wave and run-up (tsunami) reconstruction from a fossil submarine landslideWe discuss a mathematical model for wave and run-up generated submarine landslides in the canyons of the Bay of Naples (Magnaghi-Dohrn canyon system). The morpho-bathymetry and submarine gravity instabilities of such incisions have been investigated through the interpretation of a high resolution DEM. The canyons are located in a sector of the bay where there is a variable interaction of volcanic activity (Phlegrean Fields and Ischia and Procida Islands) with sedimentary processes due to the Sarno-Sebeto rivers. At present the Naples canyon-system is inactive, as is shown by the Holocene sedimentary drapes deposited during the present sea-level highstand, but gravity instabilities occurred in the recent past at the canyons' heads. In particular the Dohrn Canyon is characterized by a double regressive head, while the Magnaghi Canyon shows a trilobate head, formed by the junction of three main tributary channels and coincident with the retreat of the shelf break around the 140 m isobath. The results of a simulation of failures in the above source areas show that the amplitude of wave run-up, expressed in terms of the sea floor depth percentage, may range up to 2.5 % of the water depth at the sea bottom.

Tectono-stratigraphic modelling of the North Sicily continental margin (southern Tyrrhenian Sea)

2004 ◽  
Vol 384 (1-4) ◽  
pp. 257-273 ◽  
Author(s):  
Fabrizio Pepe ◽  
Giovanni Bertotti ◽  
Sierd Cloetingh
Keyword(s):  
Continental Margin ◽  
Tyrrhenian Sea ◽  
The North ◽  
Southern Tyrrhenian Sea

Late Quaternary Tectonics vs Sedimentation history of the offshore Termini in a seismically active segment of the Northern Sicily Continental margin (Southern Tyrrhenian Sea)

2020 ◽  
Author(s):  
Elisabetta Zizzo ◽  
Attilio Sulli ◽  
Daniele Spatola ◽  
Christian Gorini ◽  
Maurizio Gasparo Morticelli
Keyword(s):  
High Resolution ◽  
Continental Margin ◽  
Late Quaternary ◽  
Mass Movement ◽  
Strike Slip ◽  
Seismic Facies ◽  
Tyrrhenian Sea ◽  
Depositional Sequence ◽  
Coastal Belt ◽  
Southern Tyrrhenian Sea

<p>We investigate the tectonically active Northern Sicily Continental margin focusing on the neotectonics affecting the Offshore of Termini (Southern Tyrrhenian Sea) by using high-resolution seismic and multibeam data. The sedimentary succession along the North Sicilian Continental Margin (NSCM) represents the marine prolongation of those outcropping along the Northern Sicily coastal belt. The NSCM has been originated as a consequence of a complex interaction of compressional events, crustal thinning, and strike-slip faulting. E–W, NW–SE, and NE–SW trending, both extensional and compressional faults, with a local strike-slip component, exerted control on the morphology of the present-day shelf and coastal areas during the Pleistocene. During the Quaternary,  the tectonic as well as depositional events have strongly shaped the margin forming the actual complex geomorphic setting of the margin. We present the main results of a high resolution survey that allow to identify several features (e.g. Mass Transport Deposits and pockmarks) linked to gravitational mass movement and fluids escape processes strongly controlled by the tectonics affecting the NSCM. All over the study area, we mapped inside the Late Quaternary depositional sequence repeated and variously distributed MTDs, characterised by transparent/chaotic seismic facies, interbedded to hemipelagic deposits, with seismic facies showing subparallel seismic reflectors of the transgressive and high stand systems tracts. We infer that this MTDs have been seismically induced by earthquakes.  We estimate the recurrence times of earthquakes, by using an elaborate age-model that considers a constant sedimentation rate for the last 11.5 My, between 680 and 2200 years.</p>

scholarly journals Submarine Slope Failures Along the Northern Sicilian Continental Margin (Southern Tyrrhenian Sea) and Possible Implications for Geo-Hazard

2013 ◽  
pp. 41-48
Author(s):  
Attilio Sulli ◽  
Mauro Agate ◽  
Claudio Lo Iacono ◽  
Valeria Lo Presti ◽  
Valentina Pennino ◽  
...  
Keyword(s):  
Continental Margin ◽  
Tyrrhenian Sea ◽  
Slope Failures ◽  
Submarine Slope ◽  
Southern Tyrrhenian Sea
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