The East Coast oysters open the history of earthquakes

Thursday May 21 2020, 11:19 AM PRESS RELEASE: Earthquake Committee

New EQC funded research will enable scientists to
Determine more accurately the frequency and volume
Past earthquakes and tsunamis on the north east coast
Island.

By radioactive carbon dating shells, GNS Science
Researcher Dr. Kate Clark will present the data to the best
Anticipate future events and prepare communities for what may
Being in store along Hikurangi subduction zone.

The
Hikurangi subduction zone is believed to have been born
About 10 large or super earthquakes (up to 8.9 MW)
Over the past 7000 years it stretches from Gisborne to the beach
The top of the southern island.

Dr. Clark says so far
History of past earthquakes was not accurate enough
To build an image of what the future can do
Bring.

The oyster that died at parts of
The coastline was suddenly lifted, or lowered down, before
Previous earthquakes can give us information about magnitude
And the sites of past earthquakes. But we are limited in
The accuracy of how the shells are dated because we lack some
Critical local information about the carbon in our seas
Water.

Dr. Clark says her new research
Aim to pinpoint each event within about 50
Years.

The key to unlocking a carbon dating puzzle is
It is located in the bowels of Te Papa, which includes New
The finest serendipity group in New Zealand.

“We are very
Lucky that Te Baba has a bunch of more than 300,000 pieces
Shells, containing several million samples, date from
In the nineteenth century with notes on exactly where and when
It was collected and when the shellfish died. ”
Says.

Dr. Clarke explains that radioactive carbon is dating Te
Baba shells regarding the time they were
Collected, enabling it to calculate the age of other shells
Who died in the last earthquake and tsunami along the east
coast.

“We used previously at the New Zealand level
Average correction, but we doubted it was not appropriate
For the Hikurangi subduction zone and our earthquake eras
Can be wrong for up to 200 years in some locations ”
Says.

Dr. Clark says that the team treated the first
Samples are believed to be largely on their way
Improve the accuracy of ages for past earthquakes.

Doctor
Clark’s research is still feeling the effect
Nuclear testing conducted in the Pacific region and unable to
Use any shells after the 1952 nuclear test.

“The
Nuclear bombs cause all the carbon isotopes in the world
The atmosphere and ocean go to hair, so carbon is back
Any oyster that died after 1952 is no longer reliable. ”
Says.

Dr. Clark says that the best dating of radioactive carbon will be will
It gives a lot of confidence in building prehistoric times
Record earthquakes and tsunami to the east of the North Island
The coast and provide a realistic picture of the dangers on
future.

Aside from risk modeling, Dr. Clarke says
The new formula will also provide important data to others
Scientists.

Archaeologists and Climate Change
Scientists will find this very helpful in their lives
Dr. Clarke, who adds that she is so grateful, says
Funding for EQC enabled her to do so
Research.

“This type of basic research is done
It didn’t fit into any regular category, so it was hard to come by
Funding, but it’s really important data for New
Zealand. “

Dr. Joe Horox of EQC says that EQC
We are pleased to support the project that will provide
Important data for understanding the New Zealand nature
Risk hazards. “There is a lot of research going on
Regarding Hikurangi subduction zone, accurately
The history of past earthquakes is an important piece of
mystery.

“It is better to understand what happened
In the past, better local communities and councils could
Understand the risks posed by large earthquakes and prepare
To reduce the impact. “

Short video
A clip with Kate Clarke explains that her search is available for
Upload to YouTube:

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