Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; August 1980; v. 70; no. 4; p. 1055-1070
© 1980 Seismological Society of America
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Microseisms: A twenty-six-second spectral line in long-period earth motion

L. GARY HOLCOMB

U.S. GEOLOGICAL SURVEY ALBUQUERQUE SEISMOLOGICAL LABORATORY BLDG. 1002, KIRTLAND AFB-EAST, ALBUQUERQUE, NEW MEXICO 87115

Abstract

A narrow-band microseismic peak exists in worldwide earth background near a period of 26 sec. During storms, the amplitude of this ground motion increases to high levels which allows detailed studies of its characteristics. Analysis indicates that the energy arrives as Rayleigh waves from a source in the southern Atlantic Ocean. The most significant property of this microseismic peak is that it is nondispersive, thereby eliminating deep-water ocean-wave dispersion as the mechanism for isolating the narrow-band energy.




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L. G. Holcomb
Spectral structure in the earth's microseismic background between 20 and 40 seconds
Bulletin of the Seismological Society of America, June 1, 1998; 88(3): 744 - 757.
[Abstract] [PDF]


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