Mt Tongariro map shows areas of risk

18:29, Nov 21 2012
Tongariro eruption - ash on car
Volcanic ash on a car at Poutu near lake Rotoaira.
Tongariro eruption - road block
Takerei Gallagher closes the road at the corner of SH1 near National Park.
Tongariro Crossing closed - Volcano eruption
The popular Tongarior Crossing walking track is closed.
Tongariro eruption
The view towards Ruapehu and Tongariro from Waiouru.
Mt Tongariro eruption
The Mt Ruapehu webcam, about 7.30am today.
Tongariro eruption - ash on road
Ash on the road from the Tongariro eruption.
Tongariro eruption
Ash and steam rise from Tongariro.
Tongariro eruption
The view of Mount Tongariro from Lake Rotoaira, on Sh46.
Tongariro eruption briefing
Authorities brief the media about the eruption.
Tongariro eruption
The sky over Ohakune hours after Tongariro's eruption.
Tongariro eruption
Ash led to all flights to and from the Napier-Hastings' airport being cancelled.
Tongariro eruption
Dave Allan scribbles on a car at Poutu, near Lake Rotoaira.
Josh and Karen Martin
Josh Martin, 14, and his mother Karen Martin cleaning up a friends' property after Mt Tongariro erupted for the first time in over 100 years.
Mt Tongariro eruption
A motorist is surrounded by a cloud of ash on SH1 after Mt Tongariro erupted for the first time in over 100 years.
Mt Tongariro eruption
Road signs and the surrounding area are coated in ash on SH1 one after Mt Tongariro erupted for the first time in over 100 years.
Mt Tongariro eruption
A pair of glasses are covered in ash after Mt Tongariro erupted for the first time in over 100 years.
Mt Tongariro eruption
A sheep is covered in ash after Mt Tongariro erupted for the first time in over 100 years.
Mt Tongariro eruption
Road signs are coated in ash on state highway one after Mt Tongariro erupted for the first time in over 100 years.
Mt Tongariro eruption
Karen Martin helps clean up ash at a friends' property after Mt Tongariro erupted for the first time in over 100 years.
Dr Jon Procter
Dr Jon Procter from Massey University holds an ash sample after Mt Tongariro.
Tongariro Alpine Crossing track
Boulders gouged out metre sized 'impact' craters along the Tongariro Alpine Crossing track near Ketetahi Hut on Mt Tongariro.
Close to the Tongariro Crossing track
Ash covering rock close to the Tongariro Crossing track from the ash cloud from the Tongariro eruption.
Ketetahi Hut
Ketetahi hut was significantly damaged during the eruption.
Tongariro track covered in ash
Boulders gouged out metre sized 'impact' craters along the Tongariro Alpine Crossing track.
Tongariro eruption
Ash blankets the slopes below the Te Maari crater on Tongariro, two days after the eruption.
Tongariro eruption
The weather closes in on Tongariro as DOC and science crews fly around the crater to get a better view, two days after the eruption.

A map showing danger zones around Mt Tongariro in the event of another eruption has been released.

The new map created by GNS Science and Massey University described the "volcanic phenomena" that might be experienced during an eruption of Mt Tongariro as part of the current unrest episode.

It is designed to highlight the most hazardous areas which should be avoided in an eruption.

Hazard zones to avoid in an eruption
.

The map marks out the areas most at risk from flying hot rocks and explosions, and those at risk from mud, hot ash and lava flows. The area crosses State Highway 46 and spreads into Lake Rotoaira.

The map has prompted warnings for people driving along the highway not to stop their vehicles within the hazard area.

The alert level for the volcano is at level two, with five the highest.

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Hazard zones to avoid in an eruption
.

A GeoNet update yesterday said activity remained "weak".

Meanwhile, heavy rain yesterday caused small lahars on the mountain's ash coated slopes, briefly blocking nearby State Highway 46.

GeoNet vulcanologist Graham Leonard said any mudflow on a volcano was considered a lahar, but stressed that yesterday's mudslides had been expected.

There had not been another "eruptive event", he said. "It's quite a common occurrence."

Taupo Civil Defence manager Phil Parker said it was a "normal road event" unrelated to the volcano, and they would continue to monitor the road.

Mt Tongariro erupted for the first time in 100 years last week, sending ash and rock a kilometre into the air.

The Dominion Post