Scientists have successfully placed high-tech instruments along the East Coast seafloor, as part of a wider programme to keep tabs on New Zealand's biggest geological threat.
An international team of scientists set out this month to deploy the sensors at points across the Hikurangi Subduction Zone, a major offshore fault where the Pacific Plate dives – or subducts – westward beneath the North Island.
Scientists believe the subduction zone has the potential to unleash "megathrust" earthquakes larger than magnitude 8, such as those which created tsunamis that devastated Indonesia in 2004 and Japan in 2011.
Despite rough seas and bad weather, 30 high-tech instruments were deployed to collect crucial data over the next 12 months, while another 10 instruments were retrieved from a voyage last year.
The international team on Niwa's research vessel the RV Tangaroa included scientists from GNS Science and Victoria University of Wellington, Lamont Doherty Earth Observatory and Scripps Institution of Oceanography in the US, as well as Japan's Tohoku, Kyoto and Tokyo universities.