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Comments on baseline correction of digital strong-motion data: Examples from the 1999 Hector Mine, California, earthquake

Bulletin of the Seismological Society of America

By:
, , and
DOI: 10.1785/0120000926

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Abstract

Residual displacements for large earthquakes can sometimes be determined from recordings on modern digital instruments, but baseline offsets of unknown origin make it difficult in many cases to do so. To recover the residual displacement, we suggest tailoring a correction scheme by studying the character of the velocity obtained by integration of zeroth-order-corrected acceleration and then seeing if the residual displacements are stable when the various parameters in the particular correction scheme are varied. For many seismological and engineering purposes, however, the residual displacement are of lesser importance than ground motions at periods less than about 20 sec. These ground motions are often recoverable with simple baseline correction and low-cut filtering. In this largely empirical study, we illustrate the consequences of various correction schemes, drawing primarily from digital recordings of the 1999 Hector Mine, California, earthquake. We show that with simple processing the displacement waveforms for this event are very similar for stations separated by as much as 20 km. We also show that a strong pulse on the transverse component was radiated from the Hector Mine earthquake and propagated with little distortion to distances exceeding 170 km; this pulse leads to large response spectral amplitudes around 10 sec.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Comments on baseline correction of digital strong-motion data: Examples from the 1999 Hector Mine, California, earthquake
Series title:
Bulletin of the Seismological Society of America
DOI:
10.1785/0120000926
Volume
92
Issue:
4
Year Published:
2002
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Bulletin of the Seismological Society of America
First page:
1543
Last page:
1560
Number of Pages:
18