北海道における板状なだれの一特徴
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The block-type debris as Photo. 2 were found at several avalanched sites (Fig. 1) in Hokkaido.<BR>Data obtained are illustrated on Table 1 and Fig. 3.<BR>The results are summarized as follows :<BR>1. The block-type debris are formed when sliding snow are stopped just under nose of fracture lineagainst their obstacles (gentle slope, shrubs, or fixed snow depositions as Fig. 2).<BR>2. The slide surfaces of thin strata are composed of depth hoar or of granular snow in almost cases as Fig. 3.<BR>3. There are much of compact snow at the sites where the hard block-type debris are found (A, B, and E). On the other hand, there are much of granular snow where the nothing is remarkable but the loose block-type traces (C and D).<BR>4. Sliding processes of snow-slab avalanches are discussed with observations of debris forms and crack directions (Photo. 1 to Photo. 6).<BR>5. It is infered that the snow-slab avalanches of the ground avalanche type have occured widely on districts of 1.0 to 1. 5m snow depth in Hokkaido and that they have a tendency to form several slide surfaces in sliding snow concurrently.
- 社団法人 日本雪氷学会の論文
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