Abstract
Earthquake-triggered landslides pose two indirect hazards to large dams: dam collapse due to upstream dam failure, and reservoir infilling by earthquake-generated sediment. The Buller earthquake generated sediment equivalent to 800 years of normal erosion in the Karamea catchment. The effects of this and other historic earthquakes in New Zealand indicate the magnitude of the hazard to present dams and may aid in the safe design of future dams.
Highlights
Very few regions of New Zealand are totally free of earthquake risk
There is potential risk even in those parts of the axial ranges that have not been damaged by an earthquake during the short historic record (Adams1, 1980, Nishenko and McCann9, 1981)
In addition to the direct effects which earthquake shaking has on dam foundations and stability, which are engineering problems well tackled by others, there are two indirect risks to New Zealand1s present large dams to be considered in the siting and design of future dams
Summary
Very few regions of New Zealand are totally free of earthquake risk. There is potential risk even in those parts of the axial ranges (e.g. central Southern Alps, Raukumara Ranges) that have not been damaged by an earthquake during the short historic record (Adams1, 1980, Nishenko and McCann9, 1981).In addition to the direct effects which earthquake shaking has on dam foundations and stability, which are engineering problems well tackled by others, there are two indirect risks to New Zealand1s present large dams to be considered in the siting and design of future dams. DAM COLLAPSE: A major effect of earthquakes in the mountainous parts of New Zealand is the catastrophic sliding of unstable hillslopes from the mountain crests into the valleys as landslides and rock avalanches.
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