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New evidence of active transtensional deformation in apulia foreland (n-ionian sea).
Author(s)
Type
Conference paper
Language
English
Obiettivo Specifico
2TR. Ricostruzione e modellazione della struttura crostale
Status
Unpublished
Conference Name
Issued date
September 2, 2018
Conference Location
La Valletta, Malta
Subjects
Keywords
Abstract
The response of continental forelands to subduction and oblique collision is a widely investigated topic in
geodynamics. The deformation occurring within a foreland shared by two opposite-verging chains, however, is
not very common and poorly understood. The Apulia block, at the southern end of the Adria microplate,
Central Mediterranean, represents one of these latter cases, being the common foreland of the Dinarides and
Apennines orogens. In its southern part, the Apulian foreland has preserved the Mesozoic paleomargin at the
transition with the old oceanic Ionian crust that conversely underwent subduction under the Calabrian and
Hellenic arcs. For these reasons, Apulia represents an interesting and rare case of study where double orogens
and subduction have interacted with the foreland block.
As described by various authors, the almost symmetrical bending of the Apulia foreland due the opposite load
of the adjacent chains, produced a system of NW-SE trending normal faults. The precise age and the role of
these faults have not been yet determined due to the lack of available information.
In this contribution we investigated the internal deformation of the Apulia foreland using geophysical data at
various resolutions and scales over a wide area. We used multichannel seismic profiles, part of which are
provided in the collaborative framework between Spectrum Geo and INGV, recorded up to 12 s and provide a
consistent imaging of the upper crustal setting of the Apulia foreland. High-resolution multichannel seismic
profiles, multibeam high-resolution bathymetry and CHIRP profiles recently acquired by R/V OGS Explora
provide constraints on the recent activity of the major fault systems identified.
The analysis of this multiscale dataset highlights the presence and the role of a major NW-SE oriented active
fault system which obliquely cuts the Apulia foreland. The presence of this fault system has already been
hypothesized based on sparse seismic profiles, but its lateral continuity has never been documented. From the
seismic viewpoint, this structure lies in a relatively silent area. Nonetheless, it hosts the 1743 Southern Apulia
Mw 6.8 earthquake which widely damaged the Salento (S-Italy) and Ionian Islands (Greece) regions and whose
source is still a matter of debate.
This new geophysical dataset allowed us to reconstruct the 3D geometry of this fault system, whose
architecture suggests a transtensive kinematics, and to analyse the syn-tectonic basins associated with the
major faults which recorded the Late Quaternary to Holocene deformation.
This work is being developed in the frame of the project “FASTMIT”, funded by the Italian Ministry of University
and Research.
geodynamics. The deformation occurring within a foreland shared by two opposite-verging chains, however, is
not very common and poorly understood. The Apulia block, at the southern end of the Adria microplate,
Central Mediterranean, represents one of these latter cases, being the common foreland of the Dinarides and
Apennines orogens. In its southern part, the Apulian foreland has preserved the Mesozoic paleomargin at the
transition with the old oceanic Ionian crust that conversely underwent subduction under the Calabrian and
Hellenic arcs. For these reasons, Apulia represents an interesting and rare case of study where double orogens
and subduction have interacted with the foreland block.
As described by various authors, the almost symmetrical bending of the Apulia foreland due the opposite load
of the adjacent chains, produced a system of NW-SE trending normal faults. The precise age and the role of
these faults have not been yet determined due to the lack of available information.
In this contribution we investigated the internal deformation of the Apulia foreland using geophysical data at
various resolutions and scales over a wide area. We used multichannel seismic profiles, part of which are
provided in the collaborative framework between Spectrum Geo and INGV, recorded up to 12 s and provide a
consistent imaging of the upper crustal setting of the Apulia foreland. High-resolution multichannel seismic
profiles, multibeam high-resolution bathymetry and CHIRP profiles recently acquired by R/V OGS Explora
provide constraints on the recent activity of the major fault systems identified.
The analysis of this multiscale dataset highlights the presence and the role of a major NW-SE oriented active
fault system which obliquely cuts the Apulia foreland. The presence of this fault system has already been
hypothesized based on sparse seismic profiles, but its lateral continuity has never been documented. From the
seismic viewpoint, this structure lies in a relatively silent area. Nonetheless, it hosts the 1743 Southern Apulia
Mw 6.8 earthquake which widely damaged the Salento (S-Italy) and Ionian Islands (Greece) regions and whose
source is still a matter of debate.
This new geophysical dataset allowed us to reconstruct the 3D geometry of this fault system, whose
architecture suggests a transtensive kinematics, and to analyse the syn-tectonic basins associated with the
major faults which recorded the Late Quaternary to Holocene deformation.
This work is being developed in the frame of the project “FASTMIT”, funded by the Italian Ministry of University
and Research.
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