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Science 23 February 1968:
Vol. 159. no. 3817, pp. 872 - 873
DOI: 10.1126/science.159.3817.872
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Articles

Microseisms: Mode Structure and Sources

M. Nafi ToksöZ 1 and Richard T. Lacoss 1

1 Department of Geology and Geophysics, and Lincoln Laboratory, Massachusetts Institute of Technology, Cambridge

Frequency-wave number spectra of microseisms were obtained by use of a set of short-period and long-period seismometers at LASA (Large Aperture Seismic Array, Montana). At times of relatively high microseismic activity short-period (shorter than 5 seconds) microseisms consist of both body waves and higher-mode surface waves. From the phase velocity and direction of body waves, source areas were determined, coinciding with low-pressure regions on the weather map. At longer periods, microseisms consist of fundamental- mode Rayleigh and Love waves, the former being dominant. Most microseismic energy arrives at LASA from the northeast and the west.


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