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Queensland Term Abroad

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Ruapehu and the Desert Road

Volcanologist Peter Otway took us on a tour around Tongariro National Park, including stops showing some of the complex history of eruption in the park and the ongoing threat of lahar flows out of the crater lake. We spent much of our time on the eastern or "desert" flank of Ruapehu. The landscape is somber, but beautiful. The entire area was deforested in a catastrophic eruption about 2000 years ago. For unknown reasons, the vegetation has never come back.

 Waterfall cascading down into rocky pool

Waterfall coursing over the edge of one of many lava flows from Ruapehu. Note red pumice and ash below flow. Waterfall height about 20 - 25 meters.


 Mountain in clouds

Ruapehu from the road to Turoa ski area, reached from the village of Ohakune.


 Boulder deposits in riverbank

Old lahar deposits near site of Christmas Eve train disaster. In a nutshell, there was a catastrophic mud flow, or lahar, emptied out of Ruapehu's crater lake on Christmas Eve in 1953. The torrent destroyed the railroad bridge at Tangiwai. The Wellington-Auckland train plunged into the river, killing 151 people. Click here for more information.


 Students posing with snow-covered mountain in background

The sun was bright on this side of Ruapehu.


 Snowy peaks and wide, rocky valley in foreground

Lava flow evident on opposite valley wall. The valley has been enhanced by glaciers.


 Passenger vans in front of vista and radio antenna.

Looks like a Budget ad. Actually, the size of the boulders these things can drive over would amaze you. The radio tower is part of the lahar warning system.


 People standing overlooking valley

The terrain looks a little like Mars.


 View up rugged road toward mountain.

We continued up the road. Farther on, it was more like the suggestion of a road.


 Two people in front of mountain

Becky and yours truly.


 Rustic ski hut in forbidding terrain

The "road" ends at a rustic ski club. Again, the scale is deceptive. The waterfall in the background is maybe 30 meters (about 100 feet) or more high.


 Rough, rocky fore-slopes leading to snowy peaks.

Mighty Ruapehu from the east.


 People walking over rugged terrain.

We moved over to see the main lahar canyons. This area is all ski-slopes, if you can believe it.


 Rugged canyon with small stream

Jagged canyon


 Jagged, steep-sided canyon

This is one of the main lahar conduits. There's a lot going on here geologically.


 View along canyon rim

View to east.


 Students sitting on canyon rim

Joe contemplates the glory of nature.


 Students on canyon rim

Something's afoot.


 Students throwing cobbles

Two more rocks condemned to a life of grime.


 geological exposure at roadcut

Taupo pumice records gigantic eruption 2000 years ago. Black chunks within white are carbonized trees. The eruption obliterated everything, including a large forest, in its path.


 Ruapehu's summit

Ruapehu broods above us.