Journal of Geography (Chigaku Zasshi)
Online ISSN : 1884-0884
Print ISSN : 0022-135X
ISSN-L : 0022-135X
Gravity Anomalies and the Crust-mantle Structure in Japan
Hiroo KANAMORI
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1964 Volume 73 Issue 4 Pages 243-246

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Abstract

Most probable depth of the Moho discontinuity in Japan is determined mainly from the gravity analysis. Comparison of the results with other inferences from explosion and surface wave studies indicates the lower value of P and S waves in the upper mantle in Japan. This reduction in the seismic wave velocity may be attributed either to increase in the Poisson's ratio due to the temperature effects or to elastic anisotropy of rock-forming crystals which must await further studies.

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