a càrrec de Luigi Vigliotti, Instituto di Scienze Marine (ISMAR), CNR, Bologna, Italy
SEMINARIS DE LA FACULTAT DE GEOLOGIA I L'INSTITUT DE CIÈNCIES DE LA TERRA "JAUME ALMERA"

Universitat de Barcelona (UB)
Consell Superior d'Investigacions Científiques (CSIC)

Dia: Dimecres 7 de maig
Hora: 12:00h.
Lloc: Sala d'actes de l'Institut "Jaume Almera"

Resum: The Holocenic sediments of the central-eastern Mediterranean are characterized by a structurless turbidite mud, up to 30 m in thickness, known with the nickname of ―Homogenite‖. This deposit, clearly evident by an acoustically transparent facies on seismic profiles, has been considered since its discovery, in 1978, related to a tsunami originated by the 3500-years-old collapse of the Santorini Caldera. For about 30 years the history of the collapse of the Santorini Caldera and the ―Homogenite‖ has excited geologist's mind. However recent re-evaluation of the Santorini deposits suggest that the tsunami was confined near the source and it has been proposed that the trigger mechanism of the homogenite was a tsunami induced by the catastrophic collapse of the eastern flank of the Etna volcano occurred around 8 kyr B.P (Pareschi et al. 2006). However this hypothesis contrasts with stratigraphic evidences showing that the homogenite always occurs above the sapropel S1 that is dated around 6000 yr. B.P.