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Major seismic activity in the Northern Apennines concentrates in few zones, distributed in a peculiar\udway. It is argued that such context may be plausibly explained as an effect of belt-parallel\udshortening, which has caused oroclinal bending of the longitudinal ridges formed during the Late\udMiocene to Lower Pliocene evolutionary phase. The main effects of this process, developed since\udthe upper Pliocene, have mainly affected the outer sectors of the belt. The major seismic sources\udhave generated in the zones where different oroclinal bendings of adjacent ridges have produced\udextensional/transtensional deformation. In the inner side of the Northern Apennines, belt parallel\udshortening has occurred at a lower rate. The main effects have resulted from the shortening of the\udAlbano-Chianti-Rapolano-Cetona ridge. In particular, the proposed tectonic setting may account\udfor the moderate seismic activity that occurs in the Firenze, Elsa, Pesa, Siena and Radicofani basins

Belt-Parallel Shortening in the Northern Apennines and Seismotectonic Implications