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Originally posted by daaskapital
Originally posted by Utopian
hope they will just be minor
Originally posted by Blackbird1973
3 super volcanoes on one island?
New Zealand's world record eruption
A world record eruption New Zealand is home to the world's most violent eruption in the last 5000 years - the Taupo eruption of 181AD. Flows of hot ash, mud and gas moving at estimated speeds of 600-900 km/h destroyed 20,000 square kilometres of the central North Island. In total 50 cubic km of material was erupted, which is equivalent to a block with dimensions of 3.7 km across x 3.7 km wide x 3.7 km high!
Crater Lake lahar
The active vent is occupied by Crater Lake, a hot, acidic lake near the summit. The latest eruptions were in 1995-98. During 1945, water in Crater Lake was expelled by a rising dome of lava. This was then destroyed by violent explosions, generating ash that fell as far away as Wellington (250 km).
Within seven years, water had refilled the crater. On 24 December 1953, a debris dam near the lake outlet collapsed, sending an ash-laden lahar (volcanic debris mud flow) down the Whangaehu Valley. The lahar swept away the Tangiwai rail bridge, causing a train to plunge into the swollen river, killing 151 people. In 1969 and 1975 eruptions of Ruapehu generated lahars that damaged parts of the Whakapapa ski field and again in 1995 lahars ran through part of the ski area. Because Ruapehu has the potential to eject Crater Lake water down the slopes of the volcano at any time, two lahar warning systems have been put in place on the volcano, and other alarm systems installed further downstream.
In March 2007 the tephra dam at Mt Ruapehu's Crater Lake collapsed and sent a lahar down the Whangaehu River. The alarms and the emergency response plan were effective and the lahar passed down its natural path to the sea with minimal property damage.