Active deformation evidence in the offshore of western Calabria (southern Tyrrhenian Sea) from ultra-resolution multichannel seismic reflection data: results from the Gulf of Sant'Eufemia

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An ultra-resolution, multichannel seismic reflection data set was collected during anoceanographic cruise organised in the frame of the “Earthquake Potential of Active Faultsusing offshore Geological and Morphological Indicators” (EPAF) project, which was founded bythe Scientific and Technological Cooperation (Scientific Track 2017) between the Italian Ministry ofForeign Affairs and International Cooperation and the Ministry of Science, Technology and Spaceof the State of Israel. The data acquisition approach was based on innovative technologies for theoffshore imaging of stratigraphy and structures along continental margins with a horizontal andvertical resolution at decimetric scale. In this work, we present the methodology used for the 2DHR-seismic reflection data acquisition and the preliminary interpretation of the data set. The 2Dseismic data were acquired onboard the R/V Atlante by using an innovative data acquisitionequipment composed by a dual-sources Sparker system and one HR 48-channel, slant streamers,with group spacing variable from 1 to 2 meters, at 10 kHz sampling rate. An innovative navigationsystem was used to perform all necessary computations to determining real-time positions ofsources and receivers. The resolution of the seismic profiles obtained from this experiment isremarkable high respect to previously acquired seismic data for both scientific and industrialpurposes. In addition to the seismic imaging, gravity core data were also collected forsedimentological analysis and to give a chronological constraint using radiocarbon datings to theshallower reflectors. The investigated area is located in the western offshore sector of theCalabrian Arc (southern Tyrrhenian Sea) where previous research works, based on multichannelseismic profiles coupled with Chirp profiles, have documented the presence of an active faultsystem. One of the identified faults was tentatively considered as the source of the Mw 7, 8September 1905 seismic event that hit with highest macroseismic intensities the western part ofcentral Calabria, and was followed by a tsunami that inundated the coastline between Capo Vaticano and the Angitola plain. On this basis, the earthquake was considered to have a source atsea, but so far, the location, geometry and kinematics of the causative fault are still poorlyunderstood. In this study we provide preliminary results of the most technologically advancedultra-high-resolution geophysical method used to reveal the 3D faulting pattern, the lateQuaternary slip rate and the earthquake potential of the marine fault system located close to thedensely populated west coast of Calabria.
Original languageEnglish
Number of pages1
Publication statusPublished - 2020


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