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| Titel |
A close-up on the southern Apennines crustal structure |
| VerfasserIn |
Irene Bianchi, Francesco Pio Lucente, Claudio Chiarabba, Nicola Piana Agostinetti |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250102298
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| Publikation (Nr.) |
 EGU/EGU2015-1607.pdf |
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| Zusammenfassung |
| The southern Apennines of Italy undergoes intense tectonic activity and has been theater of
large and destructive earthquakes. The region is characterized by deep structural
complexities, which have been investigated in this study through the application and analysis
of receiver function data. The structural complexities are reflected in the computed
receiver functions, that in most cases lack of a clear P-direct phase on the radial
component, hint of very low velocities in the first kilometers; the receiver functions also
show strong amplitudes in the transverse component, hint of strong anisotropy.
However the large data-set analyzed and the technique adopted for the analysis
allowed us to reconstruct the crustal structures to some degree of detail. At shallow
depth our analysis, accordingly with previous studies, reveals basin sequences and
flysch units overriding limestone from former carbonate platform. In the middle
crust, at about 20 km depth, an anisotropic layer has been detected, with anisotropy
reaching up to 15%. We interpret this layer as the transition between the upper and
the lower crust, and infer that its strong anisotropic signature is due to the texture
acquired by the rocks behaving plastically under the rigid movements of upper crustal
blocks during the Plio-Pleistocene collisional phase which lead to the growth of the
Apennines. |
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