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Authors: Steckler, M.* 
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
Issue Date: Feb-2007
Keywords: receiver functions
thrust tectonics
structural geology
Subject Classification01. Atmosphere::01.03. Magnetosphere::01.03.04. Structure and dynamics 
Abstract: While the upper structure of the Southern Apennines is known, lack of control on the deep structure allows competing thin-skin and tick-skin models of the orogen. In thin-skin models the detachment decouples a stack of rootless nappes from the basement. In the tick-skin models, besement is involved in the most recent phase of thrusting. To examine crustal structure, we use teleseismic data from the CAT/SCAN array in southern Italy. We use receiver functions (RF) processed into a Common Conversion Point (CCP) stack to generate images of the crust. Interpretation and correlation to geological structure is 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 tick-skin interpretation. In a thick-skin reconstruction, the amount of shortening is much smaller than for a thin-skin model. This implies considerably less Plio-Pleistocene shortening across the Apennines and suggests an E-SE motion of the Calabrian Arc subparallel to the southern Apennines rather than a radial expansion of the Arc.
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