Not much?

Thankfully, aside from in Japan, there seems to have been very little damage from yesterday’s tsunami. However, the waves did make it across the Pacific and even though they were small – tiny even – by the time they arrived in New Zealand, the systems set out to detect them still detected them, as can be seen from this graph:

For anyone interested, the gauges listed are located here.

Noting that the waves that reached NZ were an average of about 30cm, it demonstrates the extraordinary sensitivity of their system.

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