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Authors: Santini, S.* 
Saggese, F.* 
Megna, A.* 
Mazzoli, S.* 
Title: A note on central-northern Marche seismicity: new focal mechanisms for events recorded in years 2003-2009
Issue Date: Dec-2011
Series/Report no.: 4/52(2011)
DOI: 10.4430/bgta0025
Keywords: seismicity
focal mechanisms
central Italy
Subject Classification04. Solid Earth::04.07. Tectonophysics::04.07.99. General or miscellaneous 
Abstract: A focal mechanism study was carried out for seismic events that occurred in the central-northern Marche region between 2003 and 2009. The study is based on earthquake data, having magnitude M ≤ 3.5, recorded by the seismic network of the Istituto Nazionale di Geofisica e Vulcanologia. The results show that events tend to cluster into different sectors, each being characterized by a roughly homogeneous seismological behaviour. The new data confirm the occurrence of an extensional stress regime in the axial zone of the mountain belt, generally characterized by vertical or sub-vertical P-axes. On the other hand, a different stress regime appears to dominate in the outer Apennine sector, extending from the high valley of the Marecchia River to the foothills west of Ancona. Here, the well-known extensional domain of the axial zone of the Apennine mountain belt gives way, through an area characterized by oblique-slip faulting and variably plunging P-axes, to a regime dominated by roughly horizontal P-axes along the Adriatic onshore. Roughly horizontal P-axes characterize also the adjacent Adriatic Sea sector, although some variability in the maximum compression direction occurs in the offshore area.
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