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|Authors: ||Meirova, T.*|
|Title: ||Weak-motion-based predictive relationships for the ground motion in Israel|
|Issue Date: ||2007|
|Keywords: ||ground motion Israel|
|Abstract: ||We perform a regional study in order to provide the seismic hazard community of Israel with new predictive relationships for the earthquake-induced ground motion in Israel. This work is essential for the development of a new generation of hazard maps, for the planning of the development of the Israel’s region, and the design of earthquake resistant structures and facilities. The main goals of our work is to provide a quantitative description of the expected ground motion within the Israel region, as a function of the hypocentral distance and frequency of motion. For this purpose we use the regression technique that was proposed by Yazd (1993), Herrmann (1999), Raoof et al., (1999) and Malagnini et al.,(2002). The undoubted advantage of this method is the possibility to use for analysis the data of frequent, small earthquakes that are typical for this region.
In our analyses we use 4786 waveforms recorded by 30 stations of the Israel Seismic Network from 2000 to 2005. We restricted our analysis to events recorded at 10 or more stations, resulting in 330 appropriate earthquakes, with a magnitude range between 1.8 and 5.2. We derive the empirical excitation, site, and regional attenuation terms by regressing the peak amplitudes of narrowband-filtered seismograms around the shear-waves arrivals, and the rms Fourier spectral amplitudes taken around the specific sampling frequency. A theoretical modeling effort is performed by using Random Vibration Theory (RVT) on the parameters derived from the observations. For prediction we use the quality parameter Q(f)=270f^0.7 , whereas the geometrical spreading g(r) used in the model was parameterized as a bilinear, piecewise function: r^-0.95 for r<60 km , and r^-0.5 for r>60 km . The modeling of the excitation terms is based on the Brune’s source spectrum.|
|Appears in Collections:||Manuscripts|
04.06.04. Ground motion
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