Cronin et al. (1999) presented details of an unusual data set obtained from observations of active lahars made during the 1995 eruptions of Ruapehu volcano, New Zealand. This data set includes both visual observations and time-series variations in stage height and gauged discharge made on several lahars at various distances downstream from source. Water and admixed sediment samples collected from the surfaces of the active flows provided information on time-series variations in apparent concentration and granulometry of the sediment load. Analysis of time-variable water chemistry yielded data on the mixing of the highly ion-charged and acidic Crater Lake water, ejected...

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