Three-dimensional velocity map of the upper mantle beneath the Pacific Ocean as determined from Rayleigh wave dispersion

Details Three-dimensional velocity map of the upper mantle beneath the Pacific Ocean as determined from Rayleigh wave dispersion Three-dimensional velocity map of the upper mantle beneath the Pacific Ocean as determined from Rayleigh wave dispersion

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pepi...47..205s&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 47, p. 205-229.

Physics

9

Scientific paper

A three-dimensional shear wave velocity model of the upper mantle beneath the Pacific is determined from Rayleigh wave phase velocities at periods 60-200 s without any a priori regionalization. The results clearly indicate that the velocity distribution in the uppermost 150 km is correlated with the surface tectonics. The seismic velocities of the young regions such as the East Pacific Rise and the west coast of North America are lower than the average Pacific structure by 2-5% and those of the old regions such as the northwest Pacific are higher by 2-4%. As the depth increases, the low velocity region in the southeast Pacific seems to move to the northwest. A wide area of the central Pacific shows low velocity below depths of 200-250 km. An area off the coast of western Canada exhibits a velocity lower by 4-5% above 200 km, but changes to a velocity higher by 4-5% below that depth. Cross-sections of the marginal sea regions around the Pacific (the Tasman Sea, the Philippine Sea, the Sea of Japan, the Okhotsk Sea and the Bering Sea) have quite different features from each other. The Bering Sea has a velocity lower by 1-2% above 100 km and below 300 km, and higher by 1% at depths 150-250 km. The Philippine Sea and the Sea of Japan have a velocity lower by 1-2% at depths 50-150 km and a velocity higher by 1-2% at depths 200-400 km. The Bismark Islands region and the south Fiji basin show similar velocity changes at a depth of about 250 km and 150 km, respectively. The Tasman Sea is characterized by low velocity in the upper 400 km. There is a good correlation between high velocity and seismicity below 150 km in the marginal sea regions.
Present address: Department of Geophysics, Faculty of Science, Hokkaido University, Sapporo 060, Japan.

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