More lahars expected as Ruapehu eruption ash settles
More lahars are expected after the largestRuapehu event this year when a landslide saw mud and boulders crash into the Whangaehu River on Sunday last week. Tukino Skifield workers were startled at about 1pm by a roaring noise. Institute of Geological and Nuclear Sciences (IGNS) staff who flew over the lahar reported that a piece of the north east rim of the lake basin, in a region thought to have been weakened duringthe 1995 eruption, had collapsed into the Whangaehu River Valley. The scientists said the water
level of the lake appeared to be higher and the lava dome was no longer visible. The collapse had been considered a possibility since the eruption and further lahars are expected especially during periods of heavy rainfall. The seismic record showed a seismic event had started at 1 2.57pm lasting several minutes, with considerable energy discharge recorded at the Dome but little at the Chateau or Ngauruhoe. The dominant frequency recorded was also higher than typical Crater Lake eruption events, which suggested a very shallow source, possibly a landslide.
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Ruapehu Bulletin, Volume 13, Issue 634, 30 April 1996, Page 3
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184More lahars expected as Ruapehu eruption ash settles Ruapehu Bulletin, Volume 13, Issue 634, 30 April 1996, Page 3
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