Publication Date:
2017-04-04
Description:
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 (http://iside.rm.ingv.it). 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.
Description:
Published
Description:
759-766
Description:
3.1. Fisica dei terremoti
Description:
3.2. Tettonica attiva
Description:
JCR Journal
Description:
open
Keywords:
Crustal deformations, Measurements and monitoring, earthquake source and dynamics, GPS, Emilia sequence
;
04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations
;
04. Solid Earth::04.03. Geodesy::04.03.07. Satellite geodesy
;
04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution
;
04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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