Item: Secondary alpine hazards induced by the 1995-1996 eruption of ruapehu volcano, new zealand
Title: Secondary alpine hazards induced by the 1995-1996 eruption of ruapehu volcano, new zealand
Proceedings: Proceedings of the 1996 International Snow Science Workshop, Banff, Canada
Authors: Harry (J.R.) Keys, Department of Conservation, Private Bag, Turangi, New Zealand
Abstract: Hazards due to the 1995-1996 eruption included lahars, ballistic blocks and ashfall, and a wide variety of secondary hazards induced by them, including slab and wet snow avalanches (up to class 3), point releases and secondary lahars. Secondary events (n=120) were noted over a 15 month period. Most started within 3 km of the crater, although two avalanches occurred 11 km away. Secondary lahars were most hazardous but traveled down predictable paths. Ash thicknesses as thin as 5 cm created hazardous secondary lahars that were associated with heavy rain during the spring-autumn of 1995/96. More such events, and wet snow avalanches, seem likely during the 1996 spring or 1996/97 summer.
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Keywords: secondary hazards, lahar, avalanche, volcanic ash, skifield management
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