Multibeam data from the "Wanganui Neotectonics - Back-arc Extension" voyage (TAN0105) of the R/V Tangaroa. Multibeam data was acquired on the Narrows Basin of Cook Strait as part of this voyage. The voyage was undertaken as part of the "Extensional Back-arc Processes" project of the "Active Seabed Processes" FRST programme. The objectives of the programme are to determine the contemporaneous processes of extensional faulting, subsidence and sedimentation in the Wanganui Bight and Bay of Plenty, to compare the mechanisims of extension, potential seismicity of offshore faluts, and the influence of sealevel cycles on sediment-tectonic interactions at opposite ends of the back-arc region of the Hikurangi subduction zone. Survey Leader: Geoffroy Lamrache Organisations: NIWA Bathymetric Instrument: Simrad EM300 30kHz Multibeam Navigation Instrument: DGPS Ports: Wellington to Wellington

Multichannel seismic data from the "Poverty Re-entrant" voyage (TAN0106) of the R/V Tangaroa. The voyage investigated the origin of the Poverty Re-entrant - a large margin re-entrant oalong the continental shelf off Povert Bay. It has been suggested that the Poverty Re-entrant was formed by the oblique impact of a large seamount and by massive and catastrophic avalanching of marhin rocks shattered by passage of the seamount through the margin but the original structure might be masked by later deposition, compressio, accretion of avalanche deposits, and erosion by canyons. Its structure may be further complicated by relatively recent seamount impacts. Survey Leader: Keith Lewis Organisations: NIWA Seismic Instrument: 45/105 CU.IN. GI AIRGUN, 48-channels, Uniboom Navigation Instrument: DGPS Ports: Wellington to Tauranga

Multibeam data from the "Poverty Re-entrant" voyage (TAN0106) of the R/V Tangaroa. The voyage investigated the origin of the Poverty Re-entrant - a large margin re-entrant oalong the continental shelf off Povert Bay. It has been suggested that the Poverty Re-entrant was formed by the oblique impact of a large seamount and by massive and catastrophic avalanching of marhin rocks shattered by passage of the seamount through the margin but the original structure might be masked by later deposition, compressio, accretion of avalanche deposits, and erosion by canyons. Its structure may be further complicated by relatively recent seamount impacts. Survey Leader: Keith Lewis Organisations: NIWA Bathymetric Instrument: Simrad EM300 30kHz Multibeam Navigation Instrument: DGPS Ports: Wellington to Tauranga

Multichannel seismic data from the "Wanganui Neotechtonics - Back-arc Extension" voyage (TAN0105) by the R/V Tangaroa. The voyage was undertaken as part of the "Extensional Back-arc Processes" project of the "Active Seabed Processes" FRST programme. The objectives of the programme are to determine the contemporaneous processes of extensional faulting, subsidence andc sedimentation in the Wanganui Bight and Bay of Plenty, to compare the mechanisims of extension, potential seismicity of offshore faluts, and the influence of sealevel cycles on sediment-tectonic interactions at opposite ends of the back-arc region of the Hikurangi subduction zone. Survey Leader: Geoffroy Lamarche Organisations: NIWA Seismic Instrument: 45/105 CU.IN. GI AIRGUN, 48-channels, Uniboom Navigation Instrument: DGPS Ports: Wellington to Wellington