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Eastern Ruapehu Lahar Alarm and Warning System
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Eastern Ruapehu Lahar Alarm and Warning System : ウィキペディア英語版
Eastern Ruapehu Lahar Alarm and Warning System

ERLAWS, the Eastern Ruapehu Lahar Alarm and Warning System, is a lahar warning system installed on Mount Ruapehu, New Zealand, following volcanic eruptions in 1995–1996. The system successfully detected and warned about a lahar in March 2007. The system is being expanded to detect the wider range of lahar threats now expected on Ruapehu.
==Introduction==
The 1995–1996 eruptions of Ruapehu in the North Island of New Zealand left a 7-metre high dam of tephra, consisting of volcanic ash and rock, around the rim of the crater lake.
It was realised that some time after the lake refilled and rose above the level of its normal outlet, the tephra dam would collapse, causing a large lahar. Such a lahar resulted in the 1953 Tangiwai disaster when 151 people lost their lives as the lahar swept the railway bridge away, causing a passenger train to plunge into the Whangaehu River.
In 2000 the government decided to plan, design and implement ERLAWS - a complex system of sensors and preventative mechanisms to warn of an impending lahar.

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