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This study reconstructed the vertical change of slope stability in the southern part of the Yubari Mountains and the western part of the Hidaka Range, Hokkaido, Japan, by using three eolian pumice layers deposited during the Last Glacial and early Holocene; Spfal, 33, 000-32, 000y.B.P.; En-a, 19, 000-16, 000y.B.P.; Ta-d, about 8, 000y.B.P. A pumice layer overlying a mountain slope indicates that the slope has been stabilized since the pumice fell. In this view, the examination of each pumice layer in about 330 outcrops on the mountain slope suggests a belt of slope stability in the study area, as follows:Spfal; crest slope lower than about 250m high.En-a; crest slope lower than about 500m and side slope lower than about 300m high.Ta-d; crest-side slope lower than about 1, 250m high.On the other hand, the lack of a pumice layer and/or the absence of a pumice layer which is usually incorporated in the colluvium suggest slope instability after the fall of the pumice. Several outcrops on the mountain slope suggest that the removal of the pumice layer was mainly caused by periglacial slope processes, associated with the frost shattering of the underlying bedrock. The belt higher than the belt of slope stability, in which each pumice layer was removed, therefore, corresponds to that of the periglacial belt in the period after the fall of each pumice layer. According to this view, the lower limit of the periglacial belt rose from about 250m during the 33, 000-18, 000y.B.P., to about 500m during 18, 000-8, 000y.B.P., to about 1, 250m after 8, 000y.B.P. This vertical change in slope stability is parallel to that of the timber-line and snowline of the study area which has been indicated by other data.

daiyonki kenkyū/daiyonki kenkyuu

Vertical change of slope stability from Last Glacial to early Holocene in the southern part of the Yubari mountains and the western part of the Hidaka range, Hokkaido, Japan.