Lying 50 km north of Tauranga, Mayor Island is the smallest caldera volcano in New Zealand.

Mayor Island (Tūhua) is the emergent summit of a caldera volcano roughly 750 m high and 15 km across. The island is dominated by the 3 km wide caldera collapse crater and contains numerous vents. At least 52 eruptions have been recorded from the island over the last 130,000 years.

Most Recent Eruption
about 6,300 years ago
Mayor Island
Large amounts of ash fell on the nearby North Island, and large pyroclastic flows entered the sea, almost certainly generating tsunami.