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

 


Extra Instruments Deployed to Capture Aftershock Data

Extra Instruments Deployed to Capture Aftershock Data

Scientists are deploying extra seismic instruments in Marlborough to enable more accurate measurement of the aftershocks off the coast of Seddon.

They will deploy nine instruments in coastal Marlborough over the next few days to boost the quality and quantity of data being recorded by the existing national network of instruments.

The battery-powered instruments, owned and operated by GeoNet which is funded by EQC, will be left to record for at least two weeks before the data is retrieved and analysed.

“The more accurate data will help in understanding the ruptures that are occurring and how they are linked to nearby faults off the coast of eastern Marlborough,” said seismologist Stephen Bannister of GNS Science.

It was unclear if the earthquakes were occurring on a known fault or if they were occurring on an, as yet, unidentified fault, Dr Bannister said.

By the end of this week, seismologists expect to have a clear understanding of the size and geometry of the fault that ruptured on Sunday. This will then indicate the level of stress change that has occurred on neighbouring faults
– those within a 15km radius of Sunday’s epicentre.

The faults in Cook Strait have been well mapped by NIWA. In 2008 NIWA prepared a 36-page report on Cook Strait faults as part of the multi-agency It’s Our Fault project. It shows a busy network of faults on the seabed.

There is a small possibility that some of the faults in this region could pose a tsunami threat, so scientists today issued a reminder that if people near the coast feel strong earthquake shaking for 30 seconds or longer, they
should self-evacuate and move to higher ground.

Seismic engineers are poring over data recorded from networks of instruments installed in Wellington buildings.

The instruments were installed over the past few years, and Sunday’s magnitude 6.5 quake was their first major test.

Each of the six structures has instruments placed at different levels to record how various parts of buildings perform during earthquakes. The project jointly involves GNS Science, EQC, the Department of Building and Housing, structural engineering agencies, and university engineering schools.

Knowledge gained from the recorded data will help to ensure that design standards of modern buildings can cope with the stresses imposed by strong earthquake-shaking. The buildings are the BNZ building, Wellington Hospital,
the Majestic Centre, a high-rise accommodation hall at Victoria University, and the Thorndon flyover.

Meanwhile, GNS Science has revised its aftershock probabilities for central New Zealand as follows. The figures have declined sharply since Sunday and show for the next seven days there is:

An 87% probability of a magnitude 5.0 to 5.9 aftershock – compared to 99% on Sunday
A 19% probability of a magnitude 6.0 or higher aftershock – compared to 30% on Sunday

And for the next 12 months, the figures show there is:
A 99% probability of a magnitude 5.0 to 5.9 aftershock – unchanged from Sunday
A 39% probability of a magnitude 6.0 or higher aftershock – compared to 45% on Sunday.

This last probability figure is five times higher than the equivalent figure prior to the sequence starting last Friday.
However, this figure is expected to decline sharply over the next few weeks.

The zone covered by these calculations is a large box extending from Nelson in the west to Riversdale Beach on the Wairarapa coast in the east, and from Masterton in the north to Clarence in the south.

END

© Scoop Media

 
 
 
 
 
Business Headlines | Sci-Tech Headlines

 

Company Results: Air NZ Rides The Tourism Boom With Record Full-Year Earnings

Air New Zealand has ridden the tourism boom and staved off increased competition to deliver the best full-year earnings in its 76-year history. More>>

ALSO:

New PGP: Sheep Milk Industry Gets $12.6M Crown Funding

The Sheep - Horizon Three programme aims to develop "a market driven, end-to-end value chain generating annual revenues of between $200 million and $700 million by 2030," according to a joint statement. More>>

ALSO:

Half Full: Fonterra Raises Forecast Milk Price

Fonterra Co-operative Group Limited today increased its 2016/17 forecast Farmgate Milk Price by 50 cents to $4.75 per kgMS. When combined with the forecast earnings per share range for the 2017 financial year of 50 to 60 cents, the total payout available to farmers in the current season is forecast to be $5.25 to $5.35 before retentions. More>>

ALSO:

Keep Digging: Seabed Ironsands Miner TransTasman Tries Again

The first company to attempt to gain a resource consent to mine ironsands from the ocean floor in New Zealand's Exclusive Economic Zone has lodged a new application containing fresh scientific and other evidence it hopes will persuade regulators after their initial application was turned down in 2014. More>>

Wool Pulled: Duvets Sold As ‘Premium Alpaca’ Mostly Sheep’s Wool

Rotorua business Budge Collection Limited (Budge) and sole director, Sun Dong Kim, were convicted and fined a total of $71,250 in Auckland District Court after each pleading guilty to four charges of misrepresenting how much alpaca fibre was in their duvets. More>>

Reserve Bank: Labour Calls For Monetary Policy To Expand Goals

Labour's comments follow a speech today by RBNZ governor Graeme Wheeler in which Wheeler sought to answer critics who variously say he should stop lowering interest rates, lower them faster, or that inflation-targeting should no longer be the primary goal of the central bank's activities. More>>

ALSO:

BSA Extension And Sunday Morning Ads: Digital Convergence Bill Captures Online Content

Broadcasting Minister Amy Adams has today announced the Government’s plans to update the Broadcasting Act to better reflect today’s converged market... The Government considered four areas as part of its review into content regulation: classification requirements, advertising restrictions, election programming and contestable funding. More>>

ALSO:

Get More From Scoop

 
 
 
 
 
 
 
 
 
Sci-Tech
Search Scoop  
 
 
Powered by Vodafone
NZ independent news