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Extracting rotational components of earthquake ground motion using data recorded at multiple stations
Author(s) -
Basu Dhiman,
Whittaker Andrew S.,
Constantinou Michael C.
Publication year - 2013
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/eqe.2233
Subject(s) - geodetic datum , rotation around a fixed axis , ground motion , series (stratigraphy) , geodesy , dimension (graph theory) , strong ground motion , geology , seismology , computer science , engineering , mathematics , mechanical engineering , paleontology , pure mathematics
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.