Monitoring strategies that could be developed to deal with a Crater Lake dam-failure scenario at Ruapehu Volcano

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Gledhill, K.R.; Scott, B.J. (comps) 2001 Monitoring strategies that could be developed to deal with a Crater Lake dam-failure scenario at Ruapehu Volcano . Lower Hutt: Institute of Geological & Nuclear Sciences. Institute of Geological & Nuclear Sciences science report 2001/06 22 p.

Abstract: In 1995 and 1996 moderate-sized eruptions occurred at Ruapehu Volcano. A consequence of those eruptions was the emptying of the Crater Lake and the accumulation of c.6-7 m of unconsolidated debris across the outlet area. The unconsolidated debris covering the Crater Lake outlet is not capable of holding a refilled Crater Lake and will fail, possibly producing a damaging dam-failure flood into the Whangaehu Catchment (Figure 1). It was the failure of a similar dam in 1953 that led to the Tangiwai disaster. Recognition of this prompted the Department of Conservation to review this situation and several strategies are being developed to mitigate against the potential for a hazardous event when the Crater Lake reaches overflow level. (auth)