Multichannel seismic data from the "Hikurangi Fan Drift\Ruatoria Avalanche" voyage (3057) of the R/V Tangaroa. The voyage was undertaken to map the extent of the Hikurangi Fan-drift which is a "sink" for much of the sediment that is eroded from the Southern Alps and mountain ranges of central New Zealand. It gets there via the meandering Hikurani Channel which is over 2,000km long. Additional, the voyage attempted to map the extent of the Ruatoria Avalanche. This avalanche, involving an area larger than the Coromandel Peninsula, has collapsed 2-3km (vertically) down the continental slope and travelled up to 100km out across the plain at its base. Survey Leader: Keith Lewis Organisations: NIWA Seismic Instrument: 45/105 CU.IN. GI AIRGUN, 48-channels Navigation Instrument: Furuno GP50 GPS Ports: Wellington to Wellington