On September 26, 1997. at 00.33 h (GMT), a Mw 5.7 earthquake occurred in the axial zone of the Umbria-Marche Apennines of central Italy, in the Colfiorito basin area. At 09.40 h (GMT), a Mw 6.0 earthquake again struck the area within the Colfiorito basin, a major intramontane basin filled with Quaternary continental deposits. The two main shocks, and the associated aftershocks were within a roughly NNW-SSE trending zone of largest damage (Imax 10), in which ground deformation has been observed. Along this trend, Cello et al. (1997a) had mapped a few capable faults, showing transtensional to pure extensional kinematics. Field inspection of the mapped faults, carried out after the main shocks, revealed that some of them were locally reactivated (for lengths of several hundreds metres and surface slip in the range of 2-8 cm) during the September 26, 1997 earthquakes.On September 26, 1997. at 00.33 h (GMT), a Mw 5.7 earthquake occurred in the axial zone of the Umbria-Marche Apennines of central Italy, in the Colfiorito basin area. At 09.40 h (GMT), a Mw 6.0 earthquake again struck the area within the Colfiorito basin, a major intramontane basin filled with Quaternary continental deposits. The two main shocks, and the associated aftershocks were within a roughly NNW-SSE trending zone of largest damage (Imax 10), in which ground deformation has been observed. Along this trend, Cello et al. (1997a) had mapped a few capable faults, showing transtensional to pure extensional kinematics. Field inspection of the mapped faults, carried out after the main shocks, revealed that some of them were locally reactivated (for lengths of several hundreds metres and surface slip in the range of 2-8 cm) during the September 26, 1997 earthquakes.
Geological constraints for earthquake faulting studies in the Colfiorito area (central Italy)
CELLO, Giuseppe;DEIANA, Giovanni;MAZZOLI, Stefano;TONDI, Emanuele;
2000-01-01
Abstract
On September 26, 1997. at 00.33 h (GMT), a Mw 5.7 earthquake occurred in the axial zone of the Umbria-Marche Apennines of central Italy, in the Colfiorito basin area. At 09.40 h (GMT), a Mw 6.0 earthquake again struck the area within the Colfiorito basin, a major intramontane basin filled with Quaternary continental deposits. The two main shocks, and the associated aftershocks were within a roughly NNW-SSE trending zone of largest damage (Imax 10), in which ground deformation has been observed. Along this trend, Cello et al. (1997a) had mapped a few capable faults, showing transtensional to pure extensional kinematics. Field inspection of the mapped faults, carried out after the main shocks, revealed that some of them were locally reactivated (for lengths of several hundreds metres and surface slip in the range of 2-8 cm) during the September 26, 1997 earthquakes.On September 26, 1997. at 00.33 h (GMT), a Mw 5.7 earthquake occurred in the axial zone of the Umbria-Marche Apennines of central Italy, in the Colfiorito basin area. At 09.40 h (GMT), a Mw 6.0 earthquake again struck the area within the Colfiorito basin, a major intramontane basin filled with Quaternary continental deposits. The two main shocks, and the associated aftershocks were within a roughly NNW-SSE trending zone of largest damage (Imax 10), in which ground deformation has been observed. Along this trend, Cello et al. (1997a) had mapped a few capable faults, showing transtensional to pure extensional kinematics. Field inspection of the mapped faults, carried out after the main shocks, revealed that some of them were locally reactivated (for lengths of several hundreds metres and surface slip in the range of 2-8 cm) during the September 26, 1997 earthquakes.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
