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Worldwide investigation of the mantle Rayleigh-wave group velocities

I. Dispersion data for thirty-one new great-circle paths

INTERNATIONAL INSTITUTE OF SEISMOLOGY AND EARTHQUAKE ENGINEERING, 3-28-8, HYAKUNINCHO SHINJUKU-KU Tokyo Japan

Abstract

An attempt to apply the crossing path technique to the division of the globe into similar regions of mantle Rayleigh-wave group-velocity dispersion characteristics failed because of the paucity of existing data (for about 80 great-circle paths). As a first step to achieve this goal, mantle Rayleigh-wave group velocities have been obtained for 31 new great-circle paths in the 80- to 240-sec period range. The data have been divided into four groups on the basis of dispersion behavior and compared with Dziewonski's (1971) results. An interesting finding has been the very high group velocities for the 6-MUN path, higher than any reported so far.

Footnotes

^* On leave from the National Geophysical Research Institute, Hyderabad, India.

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