Preliminary results from EMERSITO, a rapid response network for site-effect studies

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Paola Bordoni
Riccardo M. Azzara
Fabrizio Cara
Rocco Cogliano
Giovanna Cultrera
Giuseppe Di Giulio
Antonio Fodarella
Giuliano Milana
Stefania Pucillo
Gaetano Riccio
Antonio Rovelli
Paolo Augliera
Lucia Luzi
Sara Lovati
Marco Massa
Francesca Pacor
Rodolfo Puglia
Gabriele Ameri

Abstract

On May 20, 2012, at 02:03 UTC, a Ml 5.9 reverse-fault earthquake occurred in the Emilia-Romagna region, northern Italy, at a hypocentral depth of 6.3 km (http://iside.rm.ingv.it/), close to the cities of Modena and Ferrara in the plain of the Po River. The epicenter was near the village of Finale Emilia where macroseismic intensity was assessed at 7 EMS98 [Tertulliani et al. 2012, this issue], while the closest accelerometric station, MRN, located less than 20 km west-ward at Mirandola (Figure 1) recorded peaks of ground accelerations of about 300 cm/s2 (www.protezionecivile.gov.it/resources/cms/documents/Report_DPC_1_Emilia_EQSd.pdf). The mainshock triggered liquefaction phenomena a few kilometers eastwards of the epicenter, around the village of San Carlo. On the same day, two other shocks of Ml 5.1 followed (02:07, 13:18 GMT; http://iside.rm.ingv.it/). On May 29, 2012, at 07:00 UTC another Ml 5.8 earthquake hit the region (http://iside.rm.ingv.it/), with the epicenter close to the village of Mirandola (Figure 1). Three other strong aftershocks occurred afterwards, of Ml 5.3 (May 29, at 10:55), Ml 5.2 (May 29, at 11:00) and Ml 5.1 (June 3, at 19:20). For a detailed description of the seismic sequence, see Moretti et al. [2012], Scognamiglio et al. [2012], and Massa et al. [2012], in this issue. The Emilia seismic sequence resulted in 25 casualties, several of whom were among the workers in the many factories that collapsed during working hours, and there was extensive damage to monuments, public buildings, industrial sites, and private homes. […]

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1.
Bordoni P, Azzara RM, Cara F, Cogliano R, Cultrera G, Di Giulio G, Fodarella A, Milana G, Pucillo S, Riccio G, Rovelli A, Augliera P, Luzi L, Lovati S, Massa M, Pacor F, Puglia R, Ameri G. Preliminary results from EMERSITO, a rapid response network for site-effect studies. Ann. Geophys. [Internet]. 2012Oct.16 [cited 2021Nov.29];55(4). Available from: https://www.annalsofgeophysics.eu/index.php/annals/article/view/6153
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Letters

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