The paper describes a theoretical investigation of the generation of primary microseisms which have the same period as the generating sea waves and secondary microseisms which have half the period, following the work of Longuet-Higgins and Hasselmann. In particular, the mechanism in both cases by which a high phase velocity pressure wave can be formed on the sea bottom to resonate with the ground wave, as suggested by Hasselmann, is investigated. By introducting a damping term in the
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