Use of Short‐Period Microtremors for Profiling
Publication: Journal of Geotechnical Engineering
Volume 118, Issue 10
Abstract
A possible use of short‐period microtremors is examined for the determination of shallow shear wave velocity profiles. Presented for this purpose is a hybrid version of Rayleigh wave methods, in which vertical ground‐surface motions of either microtremors or forced vibrations are measured using an expanding circular array of six vertical sensors. Based on high‐resolution frequency‐wave number spectrum analysis of these data, Rayleigh wave dispersion curves can be determined. Microtremors cover the characteristics in a low‐frequency range, while forced vibrations cover them in a high‐frequency range. An inverse process that takes into account the effects of multiple Rayleigh modes on the measured dispersion data enables one to estimate profiles from the ground surface to depths more than 50 m. The profiles inferred by the proposed method are compared with those obtained by the conventional down‐hole method. The profiles from the two methods are in fairly good agreement, indicating that the use of short‐period microtremors is promising as an economical means of profiling.
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Information & Authors
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Published In
Journal of Geotechnical Engineering
Volume 118 • Issue 10 • October 1992
Pages: 1544 - 1558
Copyright
Copyright © 1992 ASCE.
History
Published online: Oct 1, 1992
Published in print: Oct 1992
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