Due to the combination of dominant near fault characteristics and amplification of ground motion by Norcia Basin, 2016 Central Italy earthquake sequence caused significant life and economic losses in the affected area. In this contribution, the response of the aforementioned basin during the M6.5 October 30 mainshock will be considered. The study focuses on the 1D and 2D responses of a single profile extracted from the idealized 3D depth-velocity model of the basin. Time domain finite element analyses (i.e. QUAD4M, Hudson, et al. 1994) and finite difference analyses (i.e. FLAC2D, Itasca 2016) are performed. In both approaches, soil layers are first assumed linear visco-elastic and, then, material nonlinearity is invoked. Analyses are conducted by scaling a signal that is recorded by a seismogram located on rock-like outcropping conditions. The results are presented in terms of maximum aggravation factors and Fourier amplification spectra for different verticals which are closer and far away from the lateral boundaries.
A comparative study on time domain 1D/2D seismic ground response analysis of Norcia basin during the M6.5 2016 October 30 earthquake
Zuccolo E.;
2019-01-01
Abstract
Due to the combination of dominant near fault characteristics and amplification of ground motion by Norcia Basin, 2016 Central Italy earthquake sequence caused significant life and economic losses in the affected area. In this contribution, the response of the aforementioned basin during the M6.5 October 30 mainshock will be considered. The study focuses on the 1D and 2D responses of a single profile extracted from the idealized 3D depth-velocity model of the basin. Time domain finite element analyses (i.e. QUAD4M, Hudson, et al. 1994) and finite difference analyses (i.e. FLAC2D, Itasca 2016) are performed. In both approaches, soil layers are first assumed linear visco-elastic and, then, material nonlinearity is invoked. Analyses are conducted by scaling a signal that is recorded by a seismogram located on rock-like outcropping conditions. The results are presented in terms of maximum aggravation factors and Fourier amplification spectra for different verticals which are closer and far away from the lateral boundaries.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
