Fossil landscapes and youthful seismogenic sources in the central Apennines: excerpts from the 24 August 2016, Amatrice earthquake and seismic hazard implications

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Gianluca Valensise
Paola Vannoli
Roberto Basili
Lorenzo Bonini
Pierfrancesco Burrato
Michele Matteo Cosimo Carafa
Umberto Fracassi
Vanja Kastelic
Francesco Emanuele Maesano
Mara Monica Tiberti
Gabriele Tarabusi

Abstract

We show and discuss the similarities among the 2016 Amatrice (Mw 6.0), 1997 Colfiorito-Sellano (Mw 6.0-5.6) and 2009 L’Aquila (Mw 6.3) earthquakes. They all occurred along the crest of the central Apennines and were caused by shallow dipping faults between 3 and 10 km depth, as shown by their characteristic InSAR signature. We contend that these earthquakes delineate a seismogenic style that is characteristic of this portion of the central Apennines, where the upward propagation of seismogenic faults is hindered by the presence of pre-existing regional thrusts. This leads to an effective decoupling between the deeper seismogenic portion of the upper crust and its uppermost 3 km.The decoupling implies that active faults mapped at the surface do not connect with the seismogenic sources, and that their evolution may be controlled by passive readjustments to coseismic strains or even by purely gravitational motions. Seismic hazard analyses and estimates based on such faults should hence be considered with great caution as they may be all but representative of the true seismogenic potential.

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How to Cite
1.
Valensise G, Vannoli P, Basili R, Bonini L, Burrato P, Carafa MMC, Fracassi U, Kastelic V, Maesano FE, Tiberti MM, Tarabusi G. Fossil landscapes and youthful seismogenic sources in the central Apennines: excerpts from the 24 August 2016, Amatrice earthquake and seismic hazard implications. Ann. Geophys. [Internet]. 2016Nov.30 [cited 2021Oct.24];59. Available from: https://www.annalsofgeophysics.eu/index.php/annals/article/view/7215
Section
Letters

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