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A New Zealand volcano has erupted for the second time in less than four months, sending a dark ash plume about 3 kilometers (1.9 miles) into the sky.
Hurst said the dark ash indicated that magma pressure deep underground caused the eruption.
Tony Hurst, a volcanologist with GNS Science, said the eruption lasted about five minutes and was unexpected, although scientists had placed the volcano on a higher alert after it erupted in August for the first time in more than a century.