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Authors: Elter, F. M.* 
Elter, P.* 
Eva, E.* 
Kraus, R. K.* 
Padovano, M.* 
Solarino, S.* 
Title: Strike-slip geometry inferred from the seismicity of the Northern-Central
Issue Date: 2011
Series/Report no.: /52 (2011)
DOI: 10.1016/j.jog.2011.03.003
Keywords: Northern Central Apennines
Riedel shear system
Focal mechanism
Subject Classification04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics 
Abstract: The aim of this paper is to draw attention to the real number and distribution of strike-slip earthquake focal mechanisms that are displayed in the recent seismicity of the Northern-Central Apennines. Their relation to the superficial normal fault plane solutions and thrust front along the Eastern side of the Apenninic chain can be described by a geometrical model (Riedel-System, also Riedel shear model). First we define three sectors characterized by their different seismological signatures: the North-Western Sector (NWS), the Western Central Sector (WCS) and the Eastern Central Sector (ECS). These three blocks, according to the available data, act independently from each other as a consequence of interaction among themselves, the forces induced by plate tectonics in the Mediterranean area and the blocking effect of the Alpine Chain, leading to an increased amount of transpressional, pure strike-slip and transtensional tectonics below 10 km depth.
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