Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Concerning baseline errors in the form of acceleration transients when recovering displacements from strong motion records using the undecimated wavelet transform

A. A. Chanerley, N. A. Alexander, J. Berrill, H. Avery, B. Halldorsson and R. Sigbjornsson
Concerning baseline errors in the form of acceleration transients when recovering displacements from strong motion records using the undecimated wavelet transform
Bulletin of the Seismological Society of America (February 2013) 103 (1): 283-295

Abstract

This paper discusses the progression of a novel algorithm that uses a wavelet-transform approach. The transform is a generalization of the decimated, discrete wavelet transform (DWT) that is the undecimated DWT or stationary wavelet transform (SWT) also known as the undecimated a trous algorithm. It forms the basis for recovering displacements from acceleration time histories. The approach recovers a low-frequency fling that is usually an almost sinusoidal or cosinusoidal pulse responsible for the big ground motions in strong motion events. The algorithm implements a well known and non-linear, denoising scheme and is applied to the low-frequency sub-band and, in particular, succeeds in recovering the acceleration-fling pulse. The progression is that in order to obtain estimates of displacements, the algorithmic baseline-correction scheme can now locate an acceleration transient (i.e., a spike), which creates the DC shift in velocity and the linear trend in displacement, and is therefore the baseline error. Once this acceleration transient is corrected for or eliminated, double-time reintegration recovers the velocity-fling pulse and residual displacement. The paper infers that these acceleration transients may be due to ground rotation, embedded in the translational data. The scheme provides for easier integration once the low- and higher-frequency accelerations are extracted.


ISSN: 0037-1106
EISSN: 1943-3573
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 103
Serial Issue: 1
Title: Concerning baseline errors in the form of acceleration transients when recovering displacements from strong motion records using the undecimated wavelet transform
Affiliation: University of East London, School of Architecture, Computing and Engineering, London, United Kingdom
Pages: 283-295
Published: 201302
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 55
Accession Number: 2013-023665
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
N63°40'00" - N66°30'00", W24°45'00" - W13°30'00"
S47°30'00" - S34°30'00", E166°30'00" - E178°30'00"
N22°00'00" - N25°30'00", E119°15'00" - E122°00'00"
Secondary Affiliation: University of Bristol, GBR, United KingdomUniversity of Canterbury, NZL, New ZealandUniversity of Iceland, ISL, Iceland
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201315
Close Modal

or Create an Account

Close Modal
Close Modal