Publication Date:
2024-03-04
Description:
The Adria plate plays a peculiar role in the geodynamics of the Central
Mediterranean. It is the foreland of non-coeval mountain ranges and its
margins are consumed in the process by subduction systems under the Alps
to the north, the Apennines to the west and the Dinarides to the east.
The complex behavior of this system and the large heterogeneity in
data availability lead to a fragmented understanding of the Adria plate. In
particular, its lithospheric structure, in terms of Vp and Vs profiles, is poorly
known due to a lack of seismic stations, poor earthquake location quality
(large observational gaps) and the consequent lack of coverage by classical
seismic tomography methods. The uncertainties increase the difficulty of
correctly assessing the seismic hazard along the Adriatic coasts (including
tsunami hazard).
Recently, we have proposed IMAGINE_IT, a reference 3D high-reso-
lution seismic tomography of the Italian lithosphere. Enhanced accuracy is
enabled by three-dimensional wavefield simulations based on SPECFEM3D
in combination with an adjoint-state method. The Adria plate is located at
the eastern border of the volume considered in the simulations, nevertheless,
our tomography is able to image this plate with an unprecedented resolution
and supports the idea that it is made of two distinct microplates having dif-
ferent fabric and behavior and separated by the Gargano deformation zone.
We have highlighted a northern portion with more complex wavespeed
anomalies and a thinner crust, and a southern part with a more regularly
layered wavespeed structure and a thicker crust. Here, we focus on additional
details of those images, such as the mid-Adriatic ridge and a new set of
iterations that exploit 7 years of additional data (IMAGINE_IT was limited
to data until 2015) and the 2016-2019 AlpArray very dense regional arrays of
broadband seismic stations which provide a new opportunity to improve our
comprehension of the area.
Description:
Published
Description:
Toronto
Description:
OST1 Alla ricerca dei Motori Geodinamici
Keywords:
Adria
;
adjoint tomography
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
Conference paper
