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Some theories of microseisms in the light of more recent findings

DEPARTMENT OF PHYSICS UNIVERSITY OF ALBERTA, EDMONTON, ALBERTA

Abstract

A review of a few recent discussions concerning different theories of generation and propagation of the 2–10 sec. microseisms is given and it is shown that Dr. Jensen's (1961) large number of determinations of direction of approach confirms some of the older findings, e.g. the microseismic barrier in the eastern North Sea. Furthermore it is shown that the dependence of microseisms on air temperature in the source area can be explained satisfactorily in terms of Longuet-Higgins theory.

After a short discussion about correlation between microseisms and meteorological data, including wave height observations, a discussion is given of an attempt to correlate microseisms in Greenland with observed waves at a certain weathership. The result was negative as far as the variation from day to day is concerned, but the characteristics of the seasonal variation of the two variables give some support to the Longuet-Higgins theory of the origin of microseisms.