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Shock and Vibration
Volume 2015, Article ID 630362, 17 pages
Research Article

Bizarre Waveforms in Strong Motion Records

1Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China
2Heilongjiang Construction Group, Harbin 150080, China
3Harbin Institute of Technology, Harbin 150080, China
4Wenzhou University, Wenzhou 325035, China
5Tongji University, Shanghai 200092, China

Received 3 March 2015; Accepted 27 May 2015

Academic Editor: Yanxue Wang

Copyright © 2015 Baofeng Zhou et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper collects a rich set of strong motion records in some typical earthquakes domestic and abroad, checks its seismic events, converts the data format, corrects the zeroline and draws the waveform. Four kinds of abnormal phenomena on the acceleration waveform are revealed, such as spike, asymmetric waveform, obvious baseline drift, and strong motion records packets separation. Then reasonable processing approaches are derived from the preliminary analysis of the generation mechanism for abnormal phenomena. In addition to the effects on time history, Fourier amplitude spectrum and response spectrum are studied before and after strong motion records correction. It is shown that (1) mechanism of spikes is rather complicated; however spikes can be eliminated by “jerk” method, ratio method, and the consistency of the three-component PGA time; (2) mechanism of the asymmetric waveform is of diversity; however, to some extent, the Butterworth low-pass filtering can be applied to correct it; (3) two pieces of strong motion record packets can be connected by searching continuous and repeated data; (4) the method of cumulative adding can be used to find the clear baseline drift; (5) the abnormal waveform directly affects the characteristics of time history and frequency spectrum.