Publication Date:
2023-11-21
Description:
This article has been accepted for publication in Geophysical Journal International ©:The Author(s) 2021. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.Uploaded in accordance with the publisher's self-archiving policy.
All rights reserved.
Description:
On 24 August 2016 at 01:36 UTC a ML6.0 earthquake struck several villages in central Italy,
among which Accumoli, Amatrice and Arquata del Tronto. The earthquake was recorded by
about 350 seismic stations, causing 299 fatalities and damage with macroseismic intensities
up to 11. The maximum acceleration was observed at Amatrice station (AMT) reaching
916 cm s–2 on E–W component, with epicentral distance of 15 km and Joyner and Boore
distance to the fault surface (RJB) of less than a kilometre. Motivated by the high levels of
observed ground motion and damage, we generate broad-band seismograms for engineering
purposes by adopting a hybrid method. To infer the low frequency seismograms, we considered
the kinematic slip model by Tinti et al . The high frequency seismograms were produced
using a stochastic finite-fault model approach based on dynamic corner-frequency. Broadband synthetic time-series were therefore obtained by merging the low and high frequency
seismograms. Simulated hybrid ground motions were compared both with the observed ground
motions and the ground-motion prediction equations (GMPEs), to explore their performance
and to retrieve the region-specific parameters endorsed for the simulations. In the near-fault
area we observed that hybrid simulations have a higher capability to detect near source effects
and to reproduce the source complexity than the use of GMPEs. Indeed, the general good
consistency found between synthetic and observed ground motion (both in the time and
frequency domain), suggests that the use of regional-specific source scaling and attenuation
parameters together with the source complexity in hybrid simulations improves ground motion
estimations. To include the site effect in stochastic simulations at selected stations, we tested
the use of amplification curves derived from HVRSs (horizontal-to-vertical response spectra)
and from HVSRs (horizontal-to-vertical spectral ratios) rather than the use of generic curves
according to NTC18 Italian seismic design code. We generally found a further reduction of
residuals between observed and simulated both in terms of time histories and spectra.
Description:
Published
Description:
1753–1779
Description:
6T. Studi di pericolosità sismica e da maremoto
Description:
JCR Journal
Keywords:
04.06. Seismology
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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