Influence of parameters selection in Chebyshev filters on the strong motion data processing |
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| Authors: | Guergana Mollova Frank Scherbaum |
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| Institution: | (1) Department of Computer-Aided Engineering, University of Architecture, Civil Engineering and Geodesy (UACEG), 1 Hr. Smirnenski Blvd., Sofia, 1046, Bulgaria;(2) Institute of Geosciences, University of Potsdam, P.O. Box 601553, 14415 Potsdam, Germany |
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| Abstract: | This contribution discusses the application of Chebyshev Type I filter for processing real earthquake records. Consideration
is given to the effects of filtering parameters (passband amplitude ripple and order of the filter) on the time series, strong-motion
parameters, Fourier Amplitude Spectrum of acceleration, and elastic displacement response spectra. Time histories of five
earthquakes with different moment magnitudes have been examined (from stations located close to the epicenters). Data processing
is based on application of bandpass Chebyshev filtering over frequency range with substantial signal to noise ratio (level
of 3 or approximately 3 dB). Applying different filters, we have monitored several important strong-motion parameters: peak
values of acceleration, velocity, and displacement; Arias intensity, acceleration/velocity spectrum intensity, significant
duration, etc. Some new results and conclusions concerning the influence of Chebyshev filter in data processing of records
have been summarized. The graphical and numerical outcomes obtained, as well as the comparison with a Butterworth causal filter,
are included in the work. The results could be potentially useful to engineering seismologists who need to evaluate and better
understand the merits of this type of filtering for strong-motion data processing. |
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| Keywords: | Acceleration Chebyshev Type I filter Digital filters Displacement Response spectra Strong-motion data Velocity |
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