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At 2797 m, Ruapehu is the highest mountain in the North Island, and the most recent of the North Island volcanoes to have erupted. Three summit craters have been active during the last 10,000 years including South Crater which contains the currently active vent. The active vent is filled by Crater Lake; water from this lake is frequently ejected on to the ice and snow during eruptions causing lahars.
These observations indicate that Ruapehu is experiencing a period of unrest above that which
is typical. At times steam may be seen above Crater Lake and sediments on the lake floor may
be disturbed by gas and heat flow causing the lake to change colour. However, there are
currently no indications that an eruption is imminent.