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http://hdl.handle.net/2122/7357
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 | Journal: | Bollettino di Geofisica Teorica ed Applicata | Series/Report no.: | 4/52(2011) | Publisher: | Istituto Nazionale di Oceanografia e di Geofisica Sperimentale - OGS, Trieste, Italy | Issue Date: | Dec-2011 | DOI: | 10.4430/bgta0025 | Keywords: | seismicity focal mechanisms central Italy Marche |
Subject Classification: | 04. 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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