Rayleigh waves from the North Pacific earthquake of November 10, 1938, have been investigated in different azimuths for dispersion. Using dispersion curves of Jeffreys based on the hypothetical structure of a single crustal layer, the average thickness of this layer along great circle paths from Bering Sea to each observatory has been calculated. The values found give a comparison between Pacific and continental crustal structure which affords confirmation of other evidence on this point.

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