抄録
Several attempts have been made to explain the microseisms, the latest being that of Longuet-HIGGINS based on the idea that they are produced by stationary waves. In this paper the author has attempted to show that in case of storms, microseisms are also likely to be generated by progressive waves. The character of microseisms has been proved to be of the RAYLEIGH type approximately. The average velocity and wave length of microseisms have been shown to agree approximately with the observational results referred to in this paper. The period-relation observed by BERNARD and DEACON viz, that the period of microseisms is half the period of sea-waves supposed to generate them, is also shown to agree. The ratio of horizontal and vertical maximum amplitudes has been found and has been shown to depend on the geological structure and not on the distance. In conclusion the possible reason for absence of microseisms on the approach of monsoons has been given as noted by GHERZI.
