Publication Date:
2017-10-19
Description:
Starting from late May 2012, the Emilia region (Northern Italy) was severely shaken by an intense seismic
sequence, originated from a ML 5.9 earthquake on May 20th, at a hypocentral depth of 6.3 km, with thrusttype
focal mechanism. In the following days, the seismic rate remained high, counting 50 ML ≥ 2.0 earthquakes
a day, on average. Seismicity spreads along a 30 km east–west elongated area, in the Po river alluvial plain, in the
nearby of the cities Ferrara and Modena. Nine days after the first shock, another destructive thrust-type earthquake
(ML 5.8) hit the area to the west, causing further damage and fatalities. Aftershocks following this second
destructive event extended along the same east-westerly trend for further 20 km to the west, thus illuminating
an area of about 50 km in length, on thewhole. After the first shock struck, on May 20th, a dense network of temporary
seismic stations, in addition to the permanent ones, was deployed in the meizoseismal area, leading to a
sensible improvement of the earthquake monitoring capability there. A combined dataset, including threecomponent
seismic waveforms recorded by both permanent and temporary stations, has been analyzed in
order to obtain an appropriate 1-D velocity model for earthquake location in the study area. Here we describe
the main seismological characteristics of this seismic sequence and, relying on refined earthquakes location,
we make inferences on the geometry of the thrust system responsible for the two strongest shocks.
Description:
Published
Description:
44-55
Description:
2T. Tettonica attiva
Description:
JCR Journal
Description:
open
Keywords:
Seismology
;
Hypocentral location
;
Seismic sequence
;
Velocity model
;
Thrust fault system
;
Po alluvial Plain
;
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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