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Bulletin of the Seismological Society of America; February 1970; v. 60; no. 1; p. 105-124
© 1970 Seismological Society of America
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Application of a vertical strain seismograph to the enhancement of P waves

ROBERT C. SHOPLAND and RICHARD H. KIRKLIN

GEOTECH, A TELEDYNE COMPANY,, 3401 SHILOH ROAD, GARLAND, TEXAS 75040

Abstract

Enhancement of P waves is obtained by the suppression of microseisms with a combination of vertical linear strain seismograph and vertical inertial seismograph outputs. Significant suppression is observed at sites where the predominant microseisms consist of essentially single-mode Rayleigh waves in contrast to that observed at a site where the microseismic noise is compositionally more complex. A description is given of the vertical linear strain seismograph used in these investigations. Consideration is given to the use of a vertical transverse strain seismograph at sites where the microseismic noise field is complex.






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