The seismic waves from the M7.7 Loyalty Islands earthquake at 2.20am this morning reached the upper North Island within 3 minutes and lasted for nearly an hour. The tsunami waves started arriving 2 and 20 minutes later. Taking a closer look at the Great Barrier Island tide gauge located in Korotiti Bay shows the sea level dropping to 0.00m at 5:38am and then surging to 1.24m at 5:41am. Technically this means the tsunami wave height was just over 60cm. This would have been quite noticeable on the shore line at the time. Fortunately high tide was still 2 hours away at the time of the highest surge.
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