Bathymetry

New Zealand joins global seabed mapping initiative

Huge mudslides from November’s earthquakes have wiped out all organisms living in the seabed of the Kaikōura Canyon.

NIWA’s flagship research vessel Tangaroa has been diverted to survey the seabed in areas affected by Monday’s earthquake.
NIWA researchers have spent part of the last month keeping a close eye on the bottom of Lake Tekapo to find out what it looks like and what is going on below the lake bed.

Marine scientists have long recognized the potential of using remotely-sensed data, most often acquired using a sonar system, as a proxy of biophysical indicators.

Now back on dry land, Voyage Leader Richard O'Driscoll reflects on the final days of RV Tangaroa's 2015 Antarctica expedition.
NIWA scientists surveying shallow water coastal habitats off the east coast of Northland have found a rich diversity of macroalgal meadows, shellfish beds, sponges, and rare fish species.
Shifting Sands - Tsunami hazard off Kaikoura, NZ

Dr Joshu Mountjoy discusses NIWA's work in assessing the tsunami hazard just south of Kaikoura. 

Find out more about this research. 

This week, New Zealand's leading coastal scientists, engineers and planners are attending the New Zealand Coastal Society 20th Annual Conference in Auckland. At the conference, NIWA's Dr Philip Barnes will explore the question of how well do we know New Zealand's submarine earthquake hazards.

New Zealand scientists are investigating active undersea volcanos, north of New Zealand. New images reveal the impacts of a significant eruption on the seafloor.

The Ocean Survey 20/20 (OS 20/20) programme is a Government initiative, which aims to provide New Zealand with better knowledge of its ocean territory, including New Zealand's Exclusive Economic Zone (EEZ), Continental Shelf and the Ross Sea Region.

NIWA's has mapped the seabed off the coast of Otago, revealing the structure of nine canyons in the Great South Basin. This survey is providing new information about geological processes in the region as well as clues to what types of life might exist on the seafloor. 

NIWA's research vessel Tangaroa will set sail from Wellington on 21 August to map the seabed in the mid-to-outer Greater Hauraki Gulf, including the coast off Coromandel.

 New Zealand's research vessel Tangaroa set sail from Wellington on Saturday to map the seabed off the coast of Otago. The survey area includes the Canterbury and Great South Basins.

Echo, Echo: Scanning the Seafloor on R.V. Tangaroa

NIWA ocean geologist Dr Joshu Mountjoy explains how the R.V. Tangaroa's multibeam system is used for bathymetric (seabed) mapping, and some of the benefits which come out of this mapping.

Seabed Frontier: A Brief History of Bathymetry

NIWA marine geologist John Mitchell gives a brief history of bathymetric (seabed) charting, and how it's been carried out over the last few hundred years. (01:18) 

Ocean water properties such as temperature are measured directly, while conductivity is used to tell us the salinity. It also captures water samples at different depths for a variety of chemical and biological measurements made either on the vessel or back in the laboratory.

Welcome to this special edition of  Natural Hazards Update, highlighting the Shallow Survey 2012.

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