Extracting rotational components of earthquake ground motion using data recorded at multiple stations |
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Authors: | Dhiman Basu Andrew S. Whittaker Michael C. Constantinou |
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Affiliation: | Department of Civil, Structural and Environmental Engineering, University at Buffalo, State University of New York, , Buffalo, NY, USA |
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Abstract: | Rotational components of earthquake ground motion have not been considered for seismic analysis, design and performance assessment because recordings of these components are unavailable. A number of procedures have been proposed to extract rotational components of ground motion from translational time series recorded at multiple, closely spaced recording stations. In this paper, a new procedure that is capable of capturing higher frequency content in rotational time‐series is presented. The frequencies at which numerical errors are introduced in the solution, which are a function of apparent wave velocity and array dimension, are identified. Results are presented for the proposed procedure, the widely accepted geodetic method, and a single‐station procedure developed by the authors, all using data recorded at the Lotung array in Taiwan. Copyright © 2012 John Wiley & Sons, Ltd. |
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Keywords: | rotational ground motion multiple recording stations spectra seismic design seismic performance assessment |
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