Publication Date:
2017-04-04
Description:
Abstract We simulated strong-motion records from the Umbria–Marche, central
Italy, earthquake (Mw 6) of September 1997 using a frequency-dependent S-wave
radiation function. We compared the observed acceleration spectra, from strongmotion
instruments located in the near field and at regional distances, with those simulated
using the stochastic modeling technique of Beresnev and Atkinson (1997,
1998), and modified to account for a frequency-dependent radiation pattern correction.
By using the frequency-dependent radiation function previously obtained by
Castro et al. (2006), we reduced the overall fitting error of the acceleration spectra
by about 9%. In general, we observed that the frequency-dependent radiation pattern
correction has a small effect on the spectral amplitudes compared with site effects,
which is an important factor controlling the strong-motion records generated
by the 1997 Umbria–Marche earthquake. In addition, we modeled the observed
ground-motion records using the dynamic corner frequency model of Motazedian
and Atkinson (2005) to reproduce the directivity effects, reducing the average error
of the spectral amplitudes by 24%. We concluded that although the frequencydependent
radiation pattern correction affects the frequency content of the spectral
amplitudes simulated, site and directivity effects are more relevant.
Description:
Published
Description:
662–670
Description:
4.1. Metodologie sismologiche per l'ingegneria sismica
Description:
JCR Journal
Description:
reserved
Keywords:
strong motion
;
simulation
;
04. Solid Earth::04.06. Seismology::04.06.04. Ground motion
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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