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Show Winters Number Av. Volume Max ( In 1000' s m3) 33/ 34 7 CO o 1- 1 1- 1 Avalanche 34/ 35 17 19 5 Tabl Freguency 35/ 36 27 112 57 e 9 on RR 36/ 37 27 24 7 Branch L 37/ 38 15 47 28 ine 38/ 39 8 4 1 39/ 40 14 45 17 In Table 10 are given data on 524 avalanches of 200 m3 and over that occurred during the winters 1933- 40 at 113 sites. Besides the avalanches covered by out station, the data include nearly 100 avalanches inspected by P. F. Semerov, A. N. Pavlov and others of the Apatit Joint Snow and Meteorological Service Board, Not included were data on 32 avalanches that took place at unknown times and on 42 whose volumes were not checked. Winters Avalanche Size Small Medium Large Very large Total Overall Volume Average Maximum ( in 1000': Free 33/ 34 6 3 1 0 10 28 2,8 10 s of m3) luency 34/ 35 16 13 1 0 30 73 2.4 20 Table 10 of Avalanches by 35/ 36 36 21 11 0 68 397 5,8 57 36/ 37 48 31 7 2 88 699 7,9 285 Size and 37/ 38 5 39 21 2 113 1181 10,4 150 Volume 38/ 39 38 25 9 1 73 465 6,4 150 39/ 40 83 41 18 0 142 635 4,5 50 Total 278 173 68 5 524 3478 6,6 285 The sharp increase in the number of avalanches beginning with the winter of 1935- 36 is explained by the inclusion here of slides occurring outside the district of regular inspection. Avalanche volumes are given in thousands of m3T graduated as follows: small: from 200 to 1000 m3; average: from 1000 to 10,000 m3; large: from 10,000 to 100,000 m3; very large: 100,000 m3 and over. Out of 142 definite slide sites, small avalanches occurred at 21, average avalanches at 47, large avalanches at 40, and very large avalanches at 5. For 29 sites no data - 52- |