釧路泥炭地とその周辺の水理地質について(上)

概要

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1. Geology 1) The Kushiro moor is a down-warped depositonal basin which is consisted of the Kushiro formation (Deluvium) and alluvial deposits. 2) The Kushiro formation (composed of gravel, sand, mud and volcanic ashes) is divided into 7 minor members, and the center of deposition in the moor was located in and around the Lake Toro in the early Pleistocene. 3) In the alluvial age, however, the center of deposition in the moor has been located in the area 4-5 km from the present coast line. 4) The writers found a buried marine terrace lying at the depth of 20~30 meters under the western part of the moor and also found buried valleys, with a maximum depth of 80 meters under the south western part and eastern part of the moor. 2. Groundwater 1) The deep artesian groundwater in the moor originates from the aquifers of the Kushiro formation and the buried terrace gravels. Alluvial deposits have only poor aquifers, because they are muddy. 2) The deep artesian groundwater in the moor derives from the terrace area to the north west of this moor. The flow of the groundwater is almost at a standstill under the central part of the moor.
一般社団法人日本応用地質学会の論文
1963-12-30