照来コールドロンの重力異常

概要

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The Pliocene Teragi Group consists of volcanic rocks, pyroclastic flows and clastic sedimentary rocks. The main part of this group fills a volcanic collapse basin. We call this volcanic collapse structure the "Teragi cauldron". A detailed map of the Bouguer gravity anomaly based on data from 612 observation points reveals that the low gravity anomaly over the Teragi Group is not a funnel-shaped, but is a pan-shaped gravity depression. The outline of the Teragi cauldron is distorted hexagon which coincides roughly with the margins of the gravity depression. Accordingly, the low gravity anomaly represents the subsurface structure of the Teragi cauldron. The mass deficiency estimated from Gauss's theorem is about 3.0X 1013 kg. The relation between this value and the cauldron diameter is comparable with those of the Quaternary calderas elsewhere in Japan.
2002-03-05