Geodynamics of the Central Mediterranean (GEOMED) inferred from ambient seismic noise

Matthew Agius*, Fabrizio Magrini, Giovanni Diaferia, Fabio Cammarano, Claudio Faccenna, Francesca Funiciello, Emanuel Kästle, M. van der Meijde

*Corresponding author for this work

Research output: Contribution to conferenceAbstractAcademic

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Abstract

The Central Mediterranean, the area encompassing Italy, Sardinia, Tunisia and Libya, is characterised by multiple tectonic processes (plate convergence, subduction, and backarc extension). The evolution and interaction of the plate margins within this relatively small area are still being unravelled particularly at the adjacent region known as the Sicily Channel located between Sicily, Tunisia, Libya and Malta. This Channel is characterised by a seismically and volcanically active rift zone. Much of the observations we have today for the southern parts of the Calabrian arc are either limited to the surface and the upper crust, or are broader and deeper from regional seismic tomography, missing important details about the lithospheric structure and dynamics. The project GEOMED (https://geomed-msca.eu) addresses this issue by processing all the seismic data available in the region in order to understand better the geodynamics of the Central Mediterranean. We measure Rayleigh- and Love-wave phase velocities from ambient seismic noise recordings to infer the structures of the Central Mediterranean, from the Central Apennines to the African foreland, with a special focus on the Sicily Channel Rift Zone (SCRZ). The phase-velocity dispersion curves have periods ranging from 5 to 100 seconds and sample through the entire lithosphere. We invert the dispersion data for isotropic and polarised shear velocities with depth and infer crustal thickness and patterns of radial anisotropy. We find that continental blocks have thick crust (30-50 km), whereas beneath the SCRZ the crust is thin (<25 km), and thinner beneath the Tyrrhenian Sea. Beneath the SCRZ and the Tyrrhenian Sea, the crustal shear velocities are characterised by positive radial anisotropy (VSH>VSV) indicative of horizontal flow or extension, whereas the uppermost mantle is characterised by slow shear velocities indicative of warmer temperatures and strong negative radial anisotropy (VSH>VSV) indicative of vertical flow. We discuss the relevance of these findings together with other geophysical studies such as the regional seismicity and GPS velocity vectors to identify the rifting process type of the SCRZ. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 843696.
Original languageEnglish
Number of pages1
DOIs
Publication statusPublished - 19 Apr 2021
EventEGU General Assembly 2021: vEGU21: Gather Online - Online
Duration: 19 Apr 202130 Apr 2021
Conference number: 679
https://www.egu21.eu/
https://ezproxy2.utwente.nl/login?url=https://library.itc.utwente.nl/login/2020/pres/jia_eco.pdf

Conference

ConferenceEGU General Assembly 2021
Abbreviated titleEGU21
CityOnline
Period19/04/2130/04/21
Internet address

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