Geodynamics of the Central Mediterranean: A multidisciplinary investigation of the Sicily Channel region

Description du projet

Vers une meilleure compréhension de la géodynamique de la Méditerranée centrale

Les marges des plaques sont sujettes aux séismes, aux tsunamis et aux éruptions volcaniques. Le projet GEOMED, financé par l’UE, contribuera à notre compréhension de ces phénomènes en étudiant l’évolution des marges des plaques lorsque de multiples processus tectoniques interagissent dans une zone réduite. Pour ce faire, GEOMED étudiera l’Arc calabrais, en accordant une attention particulière à la zone de rift du canal de Sicile, qui s’étend sur plus de 600 km au large, du sud de la Sardaigne au sud‑est de Malte. Les résultats de l’étude, qui seront intégrés dans un modèle régional analogue, permettront au projet de caractériser en détail l’évolution des marges des plaques le long des systèmes arrière-arc et de fournir d’autres informations.

Objectif

The objective of this research proposal is to understand the evolution of plate margins when multiple tectonic processes (e.g. plate convergence, subduction, and backarc extension) interact within a small area (e.g. the Calabrian arc in the Central Mediterranean). These margins are prone to catastrophic earthquakes, tsunami and volcanic eruptions, and are all linked to long-term dynamic tectonic processes. Various models explain the evolution of these plate margins, however, lack detail on the extension and rifting that takes place along the arcs. The earthquakes in these areas have a strong dependence on their location along the arc, and hence in any effort aimed at mitigating seismic risk, it is crucial to have a complete understanding of how plate tectonics work when multiple tectonic processes act.

We propose a multidisciplinary geophysical and geodynamic investigation of seismic data with additional physical constraints and analogue modelling to improve our understanding on this important aspect of plate tectonics. This will be accomplished by studying the Calabrian Arc, with a special attention on the Sicily Channel Rift Zone. We will incorporate the results into a regional analogue model to understand the nature and role of these processes, which can then be exported for studying other regions. This will allow us to characterise the evolution of plate margins along backarc systems in unprecedented detail, and to investigate the link between plate convergence, subduction, and backarc extension with the tectonics along and at the front of the arc, thus providing a new insight on the evolution of our planet.

The study will ultimately contribute to the mitigation of seismic risk by improving the seismic hazard assessment of the countries affected. Some of these places are highly inhabited areas, home to millions of citizens, a destination to millions of tourists, and have strong commercial activity off shore.