Video | Business Headlines | Internet | Science | Scientific Ethics | Technology | Search

 


New map reveals New Zealand’s seafloor in stunning detail


New map reveals New Zealand’s seafloor in stunning detail

NIWA’s new Undersea New Zealand map provides a unique insight into the shape of the seafloor in one of the world’s most extensive marine jurisdictions.

More than 90 per cent of New Zealand’s continental mass is underwater. We have one of the largest Exclusive Economic Zones and Extended Continental Shelf in the world - more than 570 million hectares of diverse marine environment, 21 times the size of our land mass.

NIWA’s ocean geologist Dr Helen Neil says, “This latest map is an asset for all New Zealanders. It’s for the person walking down the street that is really fascinated by the environment they live in, and it will also help a range of sectors understand more about our extensive marine environment. It shows in never-before-seen detail the marine realm that surrounds us.”

“New Zealand sits across a plate boundary, resulting in a diverse seascape of ridges, volcanoes, plateaux, canyons and seamounts.

“Recent technological advances mean we can now map the seabed in detail approaching that of terrestrial (land) mapping,” says Dr Neil.

The map is an updated version of the Undersea New Zealand map published in 1997. This year’s version has been created using the latest available scientific data, and is also viewable in 3D.

The updated version shows the “texture” of the seafloor and has more than 20 times the resolution of the old map. It is generated from digital elevation models using multibeam data, combined with traditional bathymetric data that reveal many, previously hidden, features.

The new map uses some 1.5 million square kilometres of multibeam coverage, with over a third of this mapped by NIWA’s research vessel Tangaroa.

There are numerous areas on this new map showing more detailed information. These include the West Coast, the Bounty Trough and the Hikurangi Channels. These were represented as simple curves on the original map, but are now mapped in detail.

“The new detail shows the abundance of sinuous canyons and channels that slice through the continental margin, allowing sediment from the land to flow into the deep ocean, both west and east of New Zealand.

“The Kermadec Trench is formed by the subduction of the Pacific Plate under the Indo-Australian Plate. It runs for over a thousand kilometres and, in some places, is over 10,000 metres deep. It is the deepest area within New Zealand waters,” says Dr Neil.

The new map illustrates the structure in that area. “You can see these folded ridges of sediment, and can imagine it being scraped off as one plate goes under another,” says Dr Neil.

There is a lot more detail of seamounts in areas like the Havre Trough, Louisville Seamount Chain, Antipodes Islands and along Chatham Rise.

“While seamounts can have similar shapes, detailed mapping highlights the potentially diverse nature of the habitats on these features,” says Dr Neil.

The Undersea New Zealand map is a culmination of NIWA’s geological, oceanographic, and fisheries research, and is created from NIWA’s database of high-resolution seafloor imagery from around New Zealand. It also incorporates significant national and worldwide data sets.

Maps like these produce substantial benefit for all New Zealanders and for all users of the marine environment, revealing potential for fisheries, environmental management, conservation, hazard mitigation, and energy and mineral opportunities.

The chart will be publically available from Monday 26 November. For more information visit: www.niwa.co.nz/publications/posters.

Dr Helen Neil is a keynote speaker at the Geosciences New Zealand Conference, being held in Hamilton from 26-28 November. Her talk is on Monday 26 November at 1.30pm.



Caption
Undersea New Zealand, a high resolution image of the complex and diverse marine realm around New Zealand.

Undersea New Zealand provides a unique insight into the shape of the seafloor within one of the world’s most extensive deepwater jurisdictions. New Zealand straddles an active plate margin, creating a highly complex and diverse seascape of submarine trenches, underwater volcanoes, active submarine canyons and quiescent broad plateaux.

Photo credit NIWA
Notes Copyright 2012 NIWA

Other information about this item:
https://www.niwa.co.nz/our-science/oceans/common-questions/all/seafloor-mapping
https://www.niwa.co.nz/our-services/instruments/instruments/em300

© Scoop Media

 
 
 
 
 
Business Headlines | Sci-Tech Headlines

 

Must Sell 20 Petrol Stations: Z Cleared To Buy Caltex Assets

Z Energy is allowed to buy the Caltex and Challenge! petrol station chains but must sell 19 of its retail sites and one truck-stop, the Commerce Commission has ruled in a split decision that acknowledges possible retail price coordination between fuel retailers occurs in some regions. More>>

ALSO:

Huntly: Genesis Extends Life Of Coal-Fuelled Power Station To 2022

Genesis Energy will keep its two coal and gas-fired units at Huntly Power Station operating until 2022, having previously said they'd be closed by 2018, after wringing a high price from other electricity generators who wanted to keep them as back-up. More>>

ALSO:

Dammed If You Do: Ruataniwha Irrigation Scheme Hits Farmer Uptake Targets

Enough Hawke's Bay farmers have signed up for water from the proposed Ruataniwha Water Storage Scheme for it to go ahead as long as a cornerstone institutional capital investor can be found to back it, its regional council promoter announced. More>>

ALSO:

Reserve Bank: OCR Stays At 2.25%

Reserve Bank governor Graeme Wheeler kept the official cash rate at 2.25 percent, in a decision traders had said could go either way, while predicting inflation will pick up as the slump in oil prices washes out of the data and capacity pressures start to build in the economy. More>>

ALSO:

Export Values Down: NZ Posts Biggest Annual Trade Deficit In 7 Years

New Zealand has recorded its biggest annual trade deficit since April 2009, reflecting weaker prices of agricultural commodities such as dairy products, beef and lamb, and increased imports of vehicles and machinery. More>>

ALSO:

Currency Events: NZ's New $5 Note Wins International Banknote Award

New Zealand’s new Brighter Money $5 note has been named Banknote of the Year in a prestigious international competition. The $5 note was awarded the IBNS Banknote of the Year title at the International Bank Note Society’s annual meeting. More>>

ALSO:

Get More From Scoop

 
 
 
 
 
 
 
 
 
Sci-Tech
Search Scoop  
 
 
Powered by Vodafone
NZ independent news