Seismic refraction experiment at the amami plateau

Azusa Nishizawa, Kiyoshi Suyehiro, Hiroshi Shimizu

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Abstract

Seismic refraction profiles were shot at the Amami Plateau, an anomalous bathymetric high among many in the West Philippine Basin. A model of the crustal structure beneath the Amami Plateau consisting of materials with compressional wavespeeds 2.0, 2.8-3.8, 5.4-5.6, and 6.7 km/sec, with thicknesses 0.3-0.7, 1.0-2.0, and 3.0-4.0 km, layered from the top, was obtained. This indicates that the 5.4-5.6 km/sec layer characterizes the structure of the plateau and implies that a wavespeed of less than 5.6 km/sec occupies more than half the crust. It is suggested, therefore, that the crustal structure is different from that of normal oceanic. The sedimentary shear wavespeed was found to be 0.39 km/sec and Poisson's ratio 0.48 from P-PS delay time produced by phase conversion at the base of the sediment.

Original languageEnglish
Pages (from-to)159-171
Number of pages13
Journaljournal of physics of the earth
Volume31
Issue number3
DOIs
Publication statusPublished - Jan 1 1983
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

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