Gravity Anomalies on Iwo-jima

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  • 5.1 硫黄島島内の重力
  • イオウジマ トウナイ ノ ジュウリョク

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Abstract

Bouguer anomalies on Iwo-jima generally become lower and lower toward the center of the island, which means that the shallow underground of the island consists of low density-volcanic ejecta. At the Motoyama area, relatively high Bouguer anomalies are found. This may show a high density-heat source, considering the extensive geothermal manifestations in the area. At the Chidorigahara area, relatively low Bouguer anomalies are found. This may show an existence of lower density-loose volcanic ash and fine cinder.

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