Ground motion simulations in the Pollino region (Southern Italy) for Mw 6.4 scenario events.
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Transcript of Ground motion simulations in the Pollino region (Southern Italy) for Mw 6.4 scenario events.
Ground motion simulations in the Pollino region (Southern Italy) for
Mw 6.4 scenario events
ITIS023 Mercure Basin Fault ITCS038 Remediello-Mormanno Composite sourceDISS reports that the seismogenic potential associated to such faults is Mw 6.4.
Source Model – Mercure Basin Fault
Approximated 1D wave-propagation (ray theory)
Lenght=22km ; Width=13kmStrike, dip, rake= 335° , 60°, -90°Top depth = 1 km Mw=6.4
Slip distribution = Heterogeneous (with 2 main patches of slip)rupture velocity = 0.8 Vs
Spectral attenuation modelR=10km R=50km
Rovelli et al., 1988Cantore et al., 2011 – Irpinia 1<f<30 HzCastro et al., 2004 – Basilicata 2<f<10 Hz
GR=1/RVs= 3.4 km/sκ =0.035 s
DSMSynthetic seismograms are computed through a modified versione of the stochastic method proposed by Boore (1983) for point source model:
• Gaussian noise is modulated with acceleration envelopes, computed solving the rapresentation theorem for an extend source
• The amplitudes are scaled applying a Reference Fourier spectrum, whose parameters (corner frequency and distance from the fault ) are inferred from the modelling of the extend source.
=
X Random Noise
Deterministic Envelope
IFFT (point-source-like Reference Spectrum)
NS
Synthetic Seismogram
Ground motion maps (PGA bedrock)
scenario 1: northwestern rupture propagation
Ground motion maps (PGA bedrock)
scenario 2: bilateral rupture propagation
Ground motion maps (PGA bedrock)
scenario 3: southeastern rupture propagation
Ground motion maps (PGA bedrock)
GMPE scenario: ITA10 mean predictions
Comparioson with empirical GMPEs
Acc. Response Spectra at 2 sites
Mormanno
Lauria
Strong motion data from RAN and INGV stations
INGV stations