表面波の分散から見た地殻-マントル構造に関する最近の二, 三の話題

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概要

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• A few regions for which special crust-mantle system has to be suggested from the observation of surface wave dispersion are given.<BR>1. Group velocity of Rayleigh waves which travelled along East-Pacific Rise shows the maximum value as low as 3.90 km/sec for such a short period as around 25 second. This result indicates the mantle with low shear wave velocity in its upper part overlain by a relatively thin crust. Group velocity dispersion curve of Rayleigh waves along Mid-Atlantic Ridge also shows the similar structure beneath the ridge.<BR>2. Lateral inhomogeneity just below Moho-discontinuity has been discussed from the observation of body waves. Phase velocity dispersion of Rayleigh waves due to a nuclear explosion test has also revealed lateral variation of elastic properties of materials below Moho in Nevada district.<BR>3. Mantle Rayleigh waves passing through the western side of Andesite - line in the western Pacific Ocean show the dispersion character remarkably different from that through other Pacific area. This fact suggests a special upper mantle situation beneath the region in question.

• 社団法人 東京地学協会の論文

著者

• 三東 哲夫

  建築研究所国際地震工学部

関連論文

• 表面波の分散から見た地殻-マントル構造に関する最近の二, 三の話題
• 地震の表面波と地殻構造 (後編) : 第3編 Mantle上部の構造
• A Review of the Investigations into Earth's Crustal Structure from the Observation of Seismic Surface Waves Part I Oceanic Basins

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