At a depth of up to 3 kilometres, the Hikurangi Channel cuts across Hikurangi Plateau and continues far out into the South Pacific Ocean. New Zealand’s tallest building, the Auckland Sky Tower (328 metres), would disappear up to its observation platform in the Hikurangi Channel. The fast-flowing flash floods that develop from avalanches at the channel’s head would easily cover the top of the tower’s aerials. Abyssal channels develop when these floods cause a build-up of the surrounding plains. The effect of the earth spinning causes more sediment to build up on one side of the channel than on the other.
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