Title: Earthquake Ground-Motion Scaling in Central Mexico between 0.7 and 7 Hz
Abstract: We present results from a regional study of ground-motion scaling parameters in central Mexico using data from a short-period vertical-component network and two broadband stations within the valley of Mexico. A total of 1220 waveforms recorded between 1994 and 2001 are used for the analysis. A damped least-squares regression using a simple model to separate the excitation, site, and propagation effects for the peak velocities in selected narrow-bandpass frequencies was carried out. The propagation term was parameterized to define a piecewise continuous geometrical spreading function, a frequency-dependent Q ( f ), and a distance-dependent duration that are consistent with the random vibration theory. We measured the average attenuation of S and Lg waves. A final model with a quality factor of Q ( f ) = 180 f 0.66 and a geometrical spreading of \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \[g(r)=\begin{array}{ll}r^{-1}&0{<}r{\leq}100\\r^{-0.2}&100{<}r{\leq}150\\r^{-0.5}&150{<}r{\leq}300\end{array}\] \end{document}
is used for the parameterization of the ground-motion scaling. We find that this region is characterized by a rapid decay of ground-motion amplitude with distance, similar to that in other tectonically active regions.
Manuscript received 23 October 2001.
Publication Year: 2003
Publication Date: 2003-02-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 20
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