Graham Bank is a dominant physiographic element of the NW Sicily Channel (central Mediterranean Sea),affected in the last 100 years by numerous well-documented volcanic eruptions.We present the first results of ageomorphological study where the Graham Bank region in the depth interval 7–350 m was mapped for the firsttime with multi-beam echosounder and high-resolution seismic and multi-channel seismic reflection profiles.We describe in high resolution the detailed geomorphological features of Graham Bank, and how the superficialexpression of different process and dynamics occurring in the sub-seafloor evidence volcanic and tectoniccontrols on seafloor morphology across a relatively small area.The north-eastern part of the study area is dominated by seamounts with heights ranging from 97 to 152mandauxiliary small cones, reaching heights of 2–10 m, on thewhole forming a hummocky surface. In this region, fluidseepages are an important expression of the volcanic processes affecting the study area. Thewestern region comprisesa flat seafloor covered by Upper Pleistocene-Holocene outer shelf sedimentary deposits; here alignedmounds and pockmarks are predominantly orientedNW–SE orNNW-SSE, running parallel to the main structuraltrend of the Sicily Channel. The pockmarks have sub-circular planform shapes and U-shaped cross-section anddifferent depths and mean axis lengths. Numerous Mass Transport Deposits (MTDs) are distributed across thestudy area. Graham Bank is 45 km from the coast of Sicily and is intersected by submarine cables. Consequently,the mapped volcanic seamounts, pockmarks and MTDs could pose a significant economic risk to the submarinecables.
|Numero di pagine||15|
|Stato di pubblicazione||Published - 2018|