Possible Method for increasing the Signal-Noise Ratio in the Detection of the First Motion of a Refracted P -Wave

IN seismology a method has been developed of examining the focal mechanisms of earthquakes by studying the azimuthal variation of the first movements on seismograms 1 . In extending this method to differentiating between small earthquakes and explosions a basic experimental problem is the detection...

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Bibliographic Details
Published in:Nature (London) 1961-09, Vol.191 (4796), p.1382-1383
Main Authors: KEY, F. A, WRIGHT, J. K, CARPENTER, E. W, STOTT, B. M. H
Format: Article
Language:English
Subjects:
Humanities and Social Sciences
letter
multidisciplinary
Science
Science (multidisciplinary)
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Summary:IN seismology a method has been developed of examining the focal mechanisms of earthquakes by studying the azimuthal variation of the first movements on seismograms 1 . In extending this method to differentiating between small earthquakes and explosions a basic experimental problem is the detection of the initial movement when its amplitude is of the order of only 10 −7 cm. in the frequency-range 1–10 c.p.s., and is therefore comparable with the background microseismic noise-level at the quietest sites. The purpose of this communication is to suggest and illustrate a possible technique of increasing the signal : noise ratio.
ISSN:0028-0836
1476-4687
DOI:10.1038/1911382a0