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http://hdl.handle.net/2122/4545
Authors: | Steckler, M. S.* Piana Agostinetti, N.* Wilson, C. K.* Roselli, P.* Seeber, L.* Amato, A.* Lerner-Lam, A.* |
Title: | Crustal structure in the Southern Apennines from teleseismic receiver functions | Journal: | Geology | Series/Report no.: | 2/36 (2008) | Publisher: | Geological Society of America | Issue Date: | Feb-2008 | DOI: | 10.1130/G24065A.1 | Keywords: | thrust tectonics Apennines continental collision seismology receiver functions structural geology |
Subject Classification: | 01. Atmosphere::01.03. Magnetosphere::01.03.04. Structure and dynamics | Abstract: | 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. |
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