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Solid Earth An interactive open-access journal of the European Geosciences Union
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Volume 9, issue 4
Solid Earth, 9, 911–922, 2018
https://doi.org/10.5194/se-9-911-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Solid Earth, 9, 911–922, 2018
https://doi.org/10.5194/se-9-911-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 18 Jul 2018

Research article | 18 Jul 2018

First evidence of active transpressive surface faulting at the front of the eastern Southern Alps, northeastern Italy: insight on the 1511 earthquake seismotectonics

Emanuela Falcucci1, Maria Eliana Poli2, Fabrizio Galadini1, Giancarlo Scardia3, Giovanni Paiero2, and Adriano Zanferrari2 Emanuela Falcucci et al.
  • 1Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, Rome, Italy
  • 2Dept. of Agricultural, Food, Environmental and Animal Sciences, University of Udine, Udine, Italy
  • 3Instituto de Geociências e Ciências Exatas, Universidade Estadual Paulista (UNESP), Rio Claro, São Paulo, Brazil

Abstract. We investigated the eastern corner of northeastern Italy, where a system of NW–SE-trending dextral strike-slip faults of western Slovenia intersects the south-verging fold and thrust belt of the eastern Southern Alps. The area suffered the largest earthquakes of the region, among which are the 1511 (Mw 6.3) event and the two major shocks of the 1976 seismic sequence, with Mw = 6.4 and 6.1. The Colle Villano thrust and the Borgo Faris–Cividale strike-slip fault have been here first analyzed by interpreting industrial seismic lines and then by performing morphotectonic and paleoseismological analyses. These different datasets indicate that the two structures define an active, coherent transpressive fault system that was activated twice in the past two millennia, with the last event occurring around the 15th–17th century. The chronological information and the location of the investigated fault system suggest its activation during the 1511 earthquake.

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We first investigated the recent activity of a major active fault system, probably responsible for the 1511 earthquake, one of the most destructive seismic events of the eastern Alps and of continental Europe over the past millennium.
We first investigated the recent activity of a major active fault system, probably responsible...
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