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|Authors: ||Scognamiglio, L.*|
|Title: ||Ground-Motion Scaling in Eastern Sicily, Italy|
|Title of journal: ||Bulletin of the Seismological Society of America|
|Series/Report no.: ||2/95(2005)|
|Issue Date: ||Apr-2005|
|Keywords: ||attenuation law|
peak ground motion
|Abstract: ||We describe the characteristics of crustal wave propagation in eastern
Sicily by using the background seismicity of the area. We follow the approach described
by Malagnini, Hermann, and Di Bona (2000) and Malagnini et al. (2002).
Our data set consists of 106 earthquakes recorded by nine three-component digital
seismic stations between 1994 and 2001. We used only crustal events (depths shallower
than 25 km), with local magnitudes ranging from 1.0 to 4.3, and hypocentral
distances from 10 to 130 km.
Peak ground velocities from 1311 narrow bandpass-filtered waveforms are measured
in the frequency range 1.0–16.0 Hz, and regressed to define crustal propagation,
excitation, and site characteristics, with respect to a reference station. A subsequent
modeling effort is carried out, through the use of random vibration theory (RVT), for
obtaining a quantitative evaluation of the apparent geometrical spreading g(r), and
of the crustal quality factor Q( f ). An attenuation parameter, j0, is also evaluated
relative to a reference rock site.
The attenuation and source parameters estimated in this study are used through
the RVT in order to predict the peak horizontal ground acceleration (PGA), and the
5% damping pseudoacceleration spectra (PSA).|
|Appears in Collections:||04.06.04. Ground motion|
Papers Published / Papers in press
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