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.