Journal of the Japan Society of Engineering Geology
Online ISSN : 1884-0973
Print ISSN : 0286-7737
ISSN-L : 0286-7737
Groundwater of Miyako-jima, Ryukyu-retto
Yoshimasa Isozaki
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1970 Volume 11 Issue 1 Pages 12-25

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Abstract
The island of Miyako is roughly triangular and very flat topography. Geologically, it consists mainly of porous, unconsolidated to partly indurated, coarse-textured limestone, resting on a bed of impervious shale, the Gusukube formation. Stracturally, the island are are tilted blocks separated by normal faults. Faulting occurred toward the end of the Tertiary, shaping the island into a series of parrallel valleys and low ridges trending northwest-southeast.
Due to high permeability of the surface layer and flat topography of the island, natural water supply on Miyako exists mainly in the form of groundwater. Hydro-geologically, the island is divided into five hydrogeologic provinces. The main part of this paper discussed the hydrogeologic provinces.
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