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

 

Scoop Business: RBNZ Keeps OCR At 3.5%, Signals Slower Pace Of Future Hikes

Reserve Bank governor Graeme Wheeler kept the official cash rate at 3.5 percent and signalled he won’t be as aggressive with future rate hikes as previously thought as inflation remains tamer than expected. The kiwi dollar fell to a seven-month low. More>>

ALSO:

Weather: Dry Spells Take Hold In South Island

Many areas in the South Island are tracking towards record dry spells as relatively warm, dry weather that began in mid-August continues... for some South Island places, the current period of fine weather is quite rare. More>>

ALSO:

Scoop Business: Productivity Commission To Look At Housing Land Supply

The Productivity Commission is to expand on its housing affordability report with an investigation into improving land supply and development capacity, particularly in areas with strong population growth. More>>

ALSO:

Forestry: Man Charged After 2013 Death

Levin Police have arrested and charged a man with manslaughter in relation to the death of Lincoln Kidd who was killed during a tree felling operation on 19 December 2013. More>>

ALSO:

Smells Like Justice: Dairy Company Fined Over Odour

Dairy company fined over odour Dairy supply company Open Country Dairy Limited has been convicted and fined more than $35,000 for discharging objectionable odour from its Waharoa factory at the time of last year’s ”spring flush” when milk supply was high. More>>

Scoop Business: Dairy Product Prices Decline To Lowest Since July 2012

Dairy product prices dropped to the lowest level since July 2012 in the latest GlobalDairyTrade auction, led by a slump in rennet casein and butter milk powder. More>>

ALSO:

SOE Results: TVNZ Lifts Annual Profit 25% On Flat Ad Revenue, Quits Igloo

Television New Zealand, the state-owned broadcaster, lifted annual profit 25 percent, ahead of forecast and despite a dip in advertising revenue, while quitting its stake in the pay-TV Igloo joint venture with Sky Network Television. More>>

ALSO:

Get More From Scoop

 
 
Computer Power Plus

Standards New Zealand

Standards New Zealand

Mosh Social Media
 
 
 
 
 
 
 
 
Sci-Tech
Search Scoop  
 
 
Powered by Vodafone
NZ independent news