- journal_title：Geology
- Contributor：Michael S. Steckler ; Nicola Piana Agostinetti ; Charles K. Wilson ; Pamela Roselli ; Leonardo Seeber ; Alessandro Amato ; Arthur Lerner-Lam
- Publisher：Geological Society of America
- Date：2008-
- Format：text/html
- Language：en
- Identifier：10.1130/G24065A.1
- journal_abbrev：Geology
- issn：0091-7613
- volume：36
- issue：2
- firstpage：155
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. Interpretation 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.