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Authors: Serpelloni, E.*
Anderlini, L.*
Avallone, A.*
Cannelli, V.*
Cavaliere, A.*
Cheloni, D.*
D'Ambrosio, C.*
D'Anastasio, E.*
Esposito, A.*
Pietrantonio, G.*
Pisani, A. R.*
Anzidei, M.*
Cecere, G.*
D'Agostino, N.*
Del Mese, S.*
Devoti, R.*
Galvani, A.*
Massucci, A.*
Melini, D.*
Riguzzi, F.*
Selvaggi, G.*
Sepe, V.*
Title: GPS observations of coseismic deformation following the May 20 and 29, 2012, Emilia seismic events (northern Italy): data, analysis and preliminary models
Title of journal: Annals Of Geophysics
Series/Report no.: 4/55 (2012)
Issue Date: 2012
DOI: 10.4401/ag-6168
Keywords: Crustal deformations, Measurements and monitoring, earthquake source and dynamics, GPS, Emilia sequence
Abstract: In May-July 2012, a seismic sequence struck a broad area of the Po Plain Region in northern Italy. The sequence in- cluded two ML >5.5 mainshocks. The first one (ML 5.9) oc- curred near the city of Finale Emilia (ca. 30 km west of Ferrara) on May 20 at 02:03:53 (UTC), and the second (ML 5.8) occurred on May 29 at 7:00:03 (UTC), about 12 km south- west of the May 20 mainshock (Figure 1), near the city of Mirandola. The seismic sequence involved an area that ex- tended in an E-W direction for more than 50 km, and in- cluded seven ML ≥5.0 events and more than 2,300 ML >1.5 events ( The focal mechanisms of the main events [Pondrelli et al. 2012, Scognamiglio et al. 2012, this volume] consistently showed compressional kinematics with E-W oriented reverse nodal planes. This sector of the Po Plain is known as a region charac- terized by slow deformation rates due to the northwards mo- tion of the northern Apennines fold-and-thrust belt, which is buried beneath the sedimentary cover of the Po Plain [Pi- cotti and Pazzaglia 2008, Toscani et al. 2009]. Early global po- sitioning system (GPS) measurements [Serpelloni et al. 2006] and the most recent updates [Devoti et al. 2011, Bennett et al. 2012] recognized that less than 2 mm/yr of SW-NE short- ening are accommodated across this sector of the Po Plain, in agreement with other present-day stress indicators [Mon- tone et al. 2012] and known active faults [Basili et al. 2008]. In the present study, we describe the GPS data used to study the coseismic deformation related to the May 20 and 29 mainshocks, and provide preliminary models of the two seismic sources, as inverted from consensus GPS coseismic deformation fields.
Appears in Collections:04.03.07. Satellite geodesy
04.03.01. Crustal deformations
04.07.07. Tectonics
04.06.01. Earthquake faults: properties and evolution
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