Science Fair Project Encyclopedia
Categories: Volcanic calderas | Taupo Volcanic Zone | Bay of Plenty-East Coast | Volcanoes of New Zealand
Rotorua Caldera
The Rotorua Caldera is one of several large volcanoes located in the Taupo Volcanic Zone on the North Island of New Zealand. Its last major eruption was about 140,000 years ago. At this time, the Mamaku Ignimbrite, covering about 4000 square km, was deposited. After the eruption, the magma chamber underneath the volcano collapsed. The circular depression left behind is the current caldera, about 16 km (10 miles) in diameter and now occupied by a lake. Mokoia Island, close to the centre of the lake, is a rhyolite dome.
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10-26-2009 08:16:03
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details