A hidden continent birthed a new subduction zone near New Zealand – Livescience.com

South of New Zealand in the Tasman Sea is a stretch of stormy ocean where the waves regularly swell 20 feet (6 meters) or more and the winds blow at 30 mph (48 km/h) on a good day. Deep below these stormy seas, Earth
is unquiet, too. This region is home to the Puysegur Trench, site of one of the youngest subduction zones on the planet. Here, the Australian plate is shoved under the Pacific plate, creating frequent large earthquakes, including a 7.2-magnitude quake in 2004. 
Now, new research reveals…

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