Surface ruptures database related to the 26 December 2018, MW 4.9 Mt. Etna earthquake, southern Italy
Fabio Villani, S. Pucci, R. Azzaro, Riccardo Civico, F. R. Cinti, Luca Pizzimenti, Gabriele Tarabusi, Stefano Branca, Carlo Alberto Brunori, M. Caciagli, Massimo Cantarero, L. Cucci, Salvatore D’Amico, Emanuela De Beni, Paolo Martini, Maria Teresa Mariucci, A. Messina, P. Montone, Rosa Nappi, Rosella Nave, D. Pantosti, Tullio Ricci, Vincenzo Sapia, Alessandra Smedile, Roberto Vallone, A. Venuti
Abstract
We provide a database of the surface ruptures produced by the 26 December 2018 Mw 4.9 earthquake that struck the eastern flank of Mt. Etna volcano in Sicily (southern Italy). Despite its relatively small magnitude, this shallow earthquake caused about 8 km of surface faulting, along the trace of the NNW-trending active Fiandaca Fault. Detailed field surveys have been performed in the epicentral area to map the ruptures and to characterize their kinematics. The surface ruptures show a dominant right-oblique sense of displacement with an average slip of about 0.09 m and a maximum value of 0.35 m. We have parsed and organized all observations in a concise database, with 932 homogeneous georeferenced records. The Fiandaca Fault is part of the complex active Timpe faults system affecting the eastern flank of Etna, and its seismic history indicates a prominent surface-faulting potential. Therefore, this database is essential for unravelling the seismotectonics of shallow earthquakes in volcanic areas, and contributes updating empirical scaling regressions that relate magnitude and extent of surface faulting.