Publication Date:
2017-04-04
Description:
While the upper crustal structure of the Southern Apennines is known, lack of control on the deep structure allows competing thin-skinned and thick-skinned models of the orogen. In
thin-skinned models, the detachment decouples a stack of rootless nappes from the basement.
In thick-skinned models, basement is involved in the most recent phase of thrusting. To examine
crustal structure, we use teleseismic data from the Calabria-Apennine-Tyrrhenian/Subduction-
Accretion-Collision Network (CAT/SCAN) array in southern Italy. We use receiver functions
(RF) processed into a common conversion point stack to generate images of the crust. Inter-
pretation and correlation to geological structure are done using inversions of individual station
RFs. We focus on a shallow discontinuity where P-to-S conversions occur. In the foreland, it
corresponds to velocity jumps between carbonate and clastic strata with basement. A similar
interpretation for the Apennines provides the most parsimonious explanation and supports a
thick-skinned interpretation. In a thick-skinned reconstruction, the amount of shortening is
much smaller than for a thin-skinned model. This implies considerably less Pliocene–Pleistocene
shortening across the Apennines and suggests an east-southeast motion of the Calabrian arc
subparallel to the southern Apennines rather than a radial expansion of the arc.
Description:
Published
Description:
155-158
Description:
3.3. Geodinamica e struttura dell'interno della Terra
Description:
JCR Journal
Description:
reserved
Keywords:
thrust tectonics
;
Apennines
;
continental collision
;
seismology
;
receiver functions
;
structural geology
;
01. Atmosphere::01.03. Magnetosphere::01.03.04. Structure and dynamics
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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