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Authors: Convertito, V.* 
Emolo, A.* 
Title: Investigating Rupture Direction for Three 2012 Moderate Earthquakes in Northern Italy from Inversion of Peak Ground-Motion Parameters
Issue Date: Dec-2012
Series/Report no.: 6/102 (2012)
DOI: 10.1785/0120120067
Keywords: Fault directivity
Peak Ground-Motion Parameters
Subject Classification04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution 
Abstract: We investigate the possibility of inferring the dominant horizontalrupture direction for moderate earthquakes from the inversion of peak ground-motion parameters. To this aim, we adopt a technique that was devised and applied to large earthquakes for retrieving both the dominant rupture direction and the surface fault projection to be used with a proper distance metric to refine the ShakeMap computation. In the present paper, the procedure was applied to three moderate earthquakes that occurred in 2012 in Northern Italy three days apart: the M 4.2 Pre-Alpi Venete earthquake on 24 January, the M 4.9 Reggio Emilia earthquake on 25 January, and the M 5.4 Parma earthquake on 27 January. For two of the three analyzed events, the technique identifies a dominant horizontal-rupture direction, which is consistent with the strike directions inferred from the focal mechanisms. For theM 5.4 event, which is a deep (about 61 km) thrust-faulting mechanism earthquake, the inferred dominant rupture direction allows identification of the northeast-dipping plane as the fault plane in accordance with the aftershocks distribution.
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