section showing the position of the two mainshocks of April 6 and 7 relative to the fault plane. A striking observation is that both the earthquakes appear located deeper than the significantly slipped areas. The study of the mainshocks sequence of the Abruzzo earthquakes clearly evidence the effect of static stress changes consecutively triggering the subsequent mainshocks. Furthermore, this analysis put in evidence the seismotectonic domains that have been more heavily charged by stress released by the Abruzzo mainshocks. The most important faults significantly charged by the Abruzzo sequence include the Sulmona and Avezzano tectonic domains. Taking into account the average regional stress build-up in the area, the positive Coulomb stress changes caused by this earthquake can be view as anticipating the next earthquakes in the neighbouring domains of some tens of years. STRUCTURAL AND GEOPHYSICAL CONSTRAINTS RELATIVE TO A “TRASCURRENT BELT”: A NEW POSSIBLE INTERPRETATION ABOUT THE FORMATION OF THE NORTHERN/CENTRAL APENNINES? F.M. Elter 1 , P. Elter 2 , C. Eva 1 , E. Eva 3 , R.K. Kraus 1 , M. Padovano 1 , S. Solarino 3 1 Dip.Te.Ris., Università di Genova, Genova 2 Località Val di Vico, Calci, Pisa 3 Istituto Nazionale di Geofisica e Vulcanologia, CNT, c/o Dip.Te.Ris., Genova The North-Central Apennines regional stress field, responsible for the development and evolu- tion of the Quaternary Shear Frame (QSF), is characterized by a NW-SE compression and by a NE- SW extension (Favali et al., 1993, Cello et al., 1997, Boncio and Lavecchia, 2000, Pizzi and Galadini, 2009). A coeval NE-SW (“Tettonica Trasversale”) and NW-SE line system is recogniza- ble in the North-Central Apennines. The “Tettonica Trasversale” (Elter, 1960, Bortolotti, 1966, Castellarin et al., 1978, Fazzini and Gelmini, 1982) or persistent structural barriers (Pizzi and Galadini, 2009) is characterized by a set of NE-SW kilometric lines that cuts the North Apenninic belt. Moving from Northwest towards Southeast, the best known persistent structural barriers are: 158 GNGTS 2009 SESSIONE 1.2 GNGTS 2009 SESSIONE 1.2 GNGTS 2009 SESSIONE 1.2 Fig. - Best fitting variable slip fault model for the April 6 and 7 mainshocks of the 2009 L’Aquila earthquake sequence, as inferred from inversion of DInSAR data. Also shown is a depth section orthogonal to the fault plane, showing the relative location of the two mainshocks with respect to modelled fault plane.