A world-wide survey of microseismic disturbances recorded during January, 1930 [book review]

Abstract

The paper contains the results of a survey of microseisms throughout the world during January, 1930, based on readings of records at sixty seven observatories. The mean amplitudes of the microseisms recorded simultaneously on two horizontal components at the same observatory are approximately equal Discrepancies are either due to errors introduced in using incorrect data concerning the instruments or to the influence of the geological formations at the stations. The ratio between the horizontal and vertical amplitudes varies from 0. 6 to 3, depending, according to the author, upon the underlying structure.

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