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Authors: Bisio, L.* 
Di Giovambattista, R.* 
Milano, G.* 
Chiarabba, C.* 
Title: Three-dimensional earthquake locations and upper crustal structure of the Sannio-Matese region (southern Italy)
Issue Date: Oct-2004
Series/Report no.: 10/385(2004)
DOI: 10.1016/j.tecto.2004.01.007
Keywords: earthquake
Subject Classification04. Solid Earth::04.01. Earth Interior::04.01.99. General or miscellaneous 
Abstract: Abstract The Sannio-Matese region is one of the most seismically active regions of Italy and has been struck by large historical earthquakes. At present, the area is characterized by low magnitude background seismicity and small seismic sequences following Mf4 main events. In this paper, we show Vp and Vp/Vs models and 3D locations for a complete set of earthquakes occurring in the period 1991–2001. We observe a significant crustal heterogeneity, with large scale east-verging high Vp faultrelated- folds, stacked by the Pliocene compression. The relocated earthquakes cluster along a 70j east-dipping, NW-striking plane located at the border of the high Vp thrust units. Normal fault earthquakes related to the young and active extension occur within these high Vp zones, interpreted as high strength material. We expect large future earthquakes to occur within these high Vp zones actually characterized by low magnitude seismicity at their borders. D 2004 Elsevier B.V. All rights reserved.
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