3D Model of the active extensional system of the high Agri River Valley,

Structural setting of the 1688 Sannio earthquake epicentral area (Southern Italy) from surface and subsurface data

“…Similar seismogenic structures along the axis of the Southern Apennine chain show slip rates of about 1 mm/a or less (Valensise and Pantosti, 2001), which correspond, at depth, to a cumulative displacement of few hundred metres (e.g. : Mazzoli et al, 2000;Borraccini et al, 2002). As frequently occurs in these cases, the quality of the available seismic lines prevents any detection of such immature extensional systems (moreover, the section of Fig.…”

“…11A and C), a striking similarity can be observed. The same location with respect to the Apennine platform and to the buried Apulia platform tectonic units can be recognised even more to the SE, for the 1857 Agri Valley earthquake (Borraccini et al, 2002;Butler et al, 2004;Figs. 2A and 11D).…”

Structural setting of the Southern Apennine fold-and-thrust belt (Italy) at hypocentral depth: The Calore Valley case history

“…Indeed, along the axis of the Southern Apennine chain, comparable seismogenic structures show slip rates of about 1 mm/a or less (Valensise and Pantosti, 2001), which correspond, at depth, to a cumulate displacement of very few hundred metres (e.g. : Mazzoli et al, 2000;Borraccini et al, 2002). As frequently occurs in these cases, the quality of the available seismic lines prevents any detection of such immature extensional systems.…”

“…The same location with respect to the Apennine platform and to the buried Apulia platform tectonic units can be recognised even more to the SE, for the 1857 Agri Valley earthquake (Butler et al, 2004, Figs. 2 and 9D), whatever the dip direction of the related extensional system main fault (Borraccini et al, 2002;Maschio et al, 2005, both with references). Moreover, for at least two of these cases (1857 and 1980 earthquakes), a thick-skinned tectonic style, with the involvement of the Paleozoic basement in the orogenic pile and its consequent uplift at shallower depths, has been recently postulated for the deepest part of the Apennine fold-and-thrust belt (Menardi Noguera and Rea, 2000;Butler et al, 2004).…”

Integrated Morphometric Analysis in GIS Environment Applied to Active Tectonic Areas

“…This earthquake has been localized along the narrow topographic culmination of the chain where the historical destructive seismicity, characterized by extensional focal mechanisms, is concentrated together with the active faults of this portion of the Southern Appenines. Different models have been suggested for the 1857 seismogenetic structure, based on: geological and structural surveys (Borraccini et al, 2002;Cello et al, 2003;Giano et al,1997Giano et al, , 2000; geomorphological analysis (Di Niro et al, 1992, Di Niro andGiano, 1995;Giano, 2011); seismotectonic analysis (Benedetti et al, 1998;Burrato & Valensise, 2008;Improta et al, 2010;Maschio et al 2005;Pantosti and Valensise, 1988;Valensise & Pantosti, 2001a), but there are still some open questions. Indeed in this region, contrasting with the events size, several tectonic and geomorphic factors concur to hide the active extensional seismogenetic faults.…”