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|Authors: ||Scafidi, D.*|
|Title: ||Can local earthquake tomography settle the matter about subduction in the Northern and Central Apennines? Response from a new high resolution P velocity and Vp/Vs ratio 3-D model|
|Title of journal: ||Tectonophysics|
|Series/Report no.: ||/554-557(2012)|
|Publisher: ||Elsevier Science Limited|
|Issue Date: ||2012|
|Keywords: ||Seismic tomography|
|Abstract: ||According to the most common interpretation, the Apennines developed in Neogene and Quaternary times in
the hanging wall of a west directed subduction zone. Seismic tomography is the most powerful tool to investigate
large volume of Earth at depth, and it has been extensively applied to shed light on the geometry and
shape of the subduction under the Italian peninsula. The various experiments were able to display the slab
under the Southern Apennines, but even the most recent tomographic images were non-uniquely interpretable
and left open questions about the characteristics of the subduction in the Northern-Central sector of the
We here present the results of an improved inversion experiment focused on the Northern and Central Apennines.
The results do not show any pronounced subduction slab and the most evident anomaly is a low velocity
body extending down to 100 km depth, located in a relatively small area under the western Tuscany.
On the basis of accurate synthetic tests, we assess that, if established, a subduction like geometry should
be visible in our tomographic images. We then conclude that no subduction is imaged in the Northern and
Central Apennines. We thus interpret this anomaly as an asthenospheric flow.
However, we cannot exclude that our result is due to intrinsic limitations of the methodology. In fact in response
to the original question about the capability of local earthquake tomography to settle the matter
about subduction, we underline that the absence of deep earthquakes to illuminate the model from below,
the existence of seismic gaps in some sectors of the area under study even at shallow depth and the non
uniqueness of interpretation of the tomographic images make local tomography unable to give alone definitive
information on the deep structure of the Northern and Central Apennines.|
|Appears in Collections:||04.06.07. Tomography and anisotropy|
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