ABSTRACT. Observations and measurements were made of high-speed avalanches at Shiai-dani, (he Kurobe canyon, (0 reveal their real features and properties, using strain-gauge-type load cells in measuring impact force and speed. A maximum impact pressure of 140 X 10 4 N m -' was obtained, as well as data indicating the existence of a number of wave fronts, ranging in speed from 9 to 60 m S-I inside an avalanche.Violent changes in atmospheric pressure ranging from -2 1 to + 5 mbar were observed near its path when a high-speed avalanche passed by. RESUME.
Preliminary results of the analyses on 700 m ice cores retrieved from Mizuho Station, Antarctica, in 1983 and 1984 are presented. The majority of the physical properties, density, grain-size and shape, and total gas content, were measured at the drilling site. Fabrics, microparticle concentration, electrical conductivity, and stable-isotope concentration 6 18 0 were measured in laboratories after the cores had been taken to Japan.In spite of inaccuracy in measuring both density and total gas content in the ice, due to interlocking cracks in cores, several attempts were made to correct the data. The coincidence between the incremental peaks in the depth profile of the microparticle concentration, as well as in the electrical conductivity and the warm trend indicated by the 6 18 0 profile is discussed. The shape of the 6 18 0 profile is characterized by two inflection points and is compared with results obtained from the Byrd Station, Dome C and Vostok cores. From this comparison, it is tentatively concluded that the bottom of the Mizuho core may be an age of the order of 10 ka B.P .
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