Geological and physical parameters of Licola and San Martino

Geological and physical parameters of Licola and San Martino

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Geological and physical parameters of the littoral area between Licola and the islet of San Martino

The area under consideration presents a detailed geology. It is part of the area identified with the name of Campi Flegrei, known for its volcanic genesis and for the volcanic phenomena still present. This also means that the seismic risk here is medium, but it decreases as we approach Licola and the mouth of the Volturno.

Through a stratigraphic study it was possible to define four cycles of formation of the Phlegraean area: the first cycle includes the formation of the Islet of San Martino, formed, together with Procida, about 35,000 years ago.

The rest of the area of ​​our interest dates back much further in the years, about 10,000 years ago.

The area upstream of the coast included in the Campi Flegrei, is made up of tuff and ignimbrites; the area closest to Licola is made up not only of volcanic products, but also of alluvial sediments due to the solid transport of the Volturno.

The last eruption in the listed Phlegraean area dates back to 1583. The phenomena that still affect the area are of the bradyseismic type.

The Domitian Coast is made up of beach and dune deposits as well as fine-grained materials from a marshy environment, the granulometry that distinguishes the seabed and the coast is sandy and with pseophytic and psammitic debris, due to the contribution of the Volturno.

From a textural point of view, 4 granulometric bands are identified, from the shore to the open sea.

The first band, which affects up to the 2m bathymetry, also 100m away from the shore line, is made up of medium sands.

The second strip, which reaches up to 3m in depth, is made up of medium-fine sands.

To find the third strip, we have to move away up to about 250m from the shore line, where the 5m bathymetry is found, consisting of fine sands.

Beyond we are in the presence of very fine sands.

Proceeding towards the islet of S. Martino, we find the cliffs that make up Monte di Procida, here the coast becomes rocky and steep, with the presence of numerous deep volcanic remains, and two canyons, one of which laps the island of Procida.

In the northern section of the area of interest to us, the slopes of the seabed can be summarized as follows: between the shoreline and the external bar it is about 1%, while beyond the areas with bars, therefore at a depth between 3 and 5.5 m, it increases up to 4-6%.

The currents affecting this area, are very particular, and of a purely local character, being an interaction between the currents that creep through the islands of Procida and Ischia, thus changing direction and intensity, and the currents coming from the average Tyrrhenian circulation, from the North.

In this stretch of coast, also due to the wall made up of the peninsula of Monte di Procida, and the aforementioned islands, the current coming from the north tends to change direction going up, and thus forming a real ring.

A study from a biochemical point of view found that the area in question has a high trophy of water. It is one of the two areas indicated for what concerns the installation of aquaculture structures.

Dr. Rossella Stocco

Video: Siccar Point - the birthplace of modern geology


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