Crustal shortening and duplication of the Moho in the Northern Apennines: a view from seismic refraction data

Separation of source and site effects by generalized inversion technique using the aftershock recordings of the 2009 L’Aquila earthquake

“…This way, we are also able to reproduce quite steep decays of spectral amplitudes at short distances with the inverted attenuation functions. (Ponziani et al, 1995;Bindi et al, 2004. The behavior of the nonparametric curves, for the 36 frequencies considered in this study (Figure 5a), suggests that the reflections and refractions from crustal interfaces, possibly shallower than the Moho, are significant in the investigated area already for distances between 30 and 50 km.…”

U and Th content in the Central Apennines continental crust: A contribution to the determination of the geo-neutrinos flux at LNGS

“…Following seismic arguments, sound speeds in the range 6.7-7.2 km/s have been detected in the area of interest (Ponziani et al, 1995;Finetti, 2005b;Cassinis et al, 2005;Mele et al, 2006;Patacca et al, 2008;Di Luzio et al, 2009). This range appear to be in agreement with the results Christensen and Mooney (1995) and Holbrook et al (1992) who measured an average p-wave velocity of 6.3 and 7.0 km/s for the felsic and mafic reservoirs respectively.…”

Fault zone architecture and deformation processes within evaporitic rocks in the upper crust

“…Geological [Carmignani et al, 1994;Jolivet et al, 1998;Collettini and Holdsworth, 2004] and geophysical [Keller et al, 1994;Barchi et al, 1998b;Collettini et al, 2006;Chiaraluce et al, 2007] data suggest that a significant amount of extension has been accommodated by east-dipping low-angle normal faults and associated antithetic structures (Figure 1). In the western sector of the Northern Apennines, Tyrrhenian islands and Tuscany, extension was active for enough time to change the geophysical character of the area: the Moho is shallow [Doglioni, 1991;Ponziani et al, 1995;Barchi et al, 1998b;Doglioni et al, 1998;Mele and Sandvol, 2003], heat flow is high [Mongelli and Zito, 1991] and magmatism is widespread [Peccerillo, 1999;Lavecchia and Stoppa, 1990;Serri et al, 1993]. The western sector is also affected by a widespread CO 2 degassing episode [Chiodini et al, 2000[Chiodini et al, , 2004.…”