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The Origins and Nature of Microseisms in the Frequency Range 4 to 100 c/s

C. D. V. Wilson
Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences
Vol. 217, No. 1129 (Apr. 8, 1953), pp. 176-188
Published by: Royal Society
Stable URL: http://www.jstor.org/stable/99020
Page Count: 17
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The Origins and Nature of Microseisms in the Frequency Range 4 to 100 c/s
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Abstract

Microseisms in the frequency band 4 to 100 c/s, commonly encountered in seismic prospecting, have been investigated in various parts of England, urban and rural. A diurnal variation in background level, indicating man-made sources, was found everywhere within 2 miles of a major road or community. The main sources were found to be traffic, heavy machinery, aircraft, wind and rain, with traffic prevailing. In rural areas at night-time a steady background of about 10-6 cm/s r.m.s. particle velocity was found, with occasional superimposed activity lasting 4 to 30 s. The latter has been shown mostly to be local and of geophysical origin, the precise nature of which is unknown. Various possible causes are discussed, both of this and of the minimum background.

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