This diagram shows the massive underwater landslide (known as the Ruatōria Giant Avalanche) that occurred off the east coast of the North Island 135,000–155,000 years ago. Part of the continental shelf collapsed and slid down to the Hikurangi Trough, on the deep sea floor. An event of this scale would have caused a tsunami. Such submarine avalanches occur rarely; smaller slips are much more common. The colossal size of this slide dwarfs even the largest landslide on the New Zealand mainland.
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