A more accurate way of identifying underground nuclear tests, including those conducted in secret, has been developed by researchers at The Australian National University (ANU).  

The new method could help international observers better identify tests carried out by countries or actors known to possess nuclear weapons, as well as providing new information about those suspected of being armed.  

According to lead author Dr Mark Hoggard, in the aftermath of the Cuban Missile Crisis and Partial Test Ban Treaty in the 1960s, testing of nuclear weapons moved underground.  

While this eliminated some risks associated with contamination by radioactive fallout, underground tests still generate a huge amount of seismic energy. 

“The explosion goes off and you have all this energy that radiates out, which can be measured on seismometers,” Dr Hoggard said. 

“So, the science problem becomes how do we tell the difference between that and a naturally occurring earthquake?” 

Dr Mark Hoggard. Photo: ANU

There has been renewed attention on the issue since some existing methods failed to correctly classify a 2017 underground nuclear test by North Korea. 

“By using some revised mathematics and more advanced statistical treatment, we have managed to improve the classification success rate from 82 per cent to 99 per cent for a series of 140 known explosions from the US,” Dr Hoggard said. 

“Nuclear testing in the US has largely been carried out in Nevada – in the desert – and there is a thorough seismic record of all those tests, so it provides a really helpful dataset. 

“Our new method also successfully identifies all six of the tests conducted in North Korea from 2006 to 2017.” 

Dr Hoggard said there may well still be instances of underground nuclear tests being carried out surreptitiously in some parts of the world, and the sheer volume of earthquakes makes it difficult to investigate each event to determine if it is suspicious or not. 
 
“This makes effective methods like ours all the more important,” Dr Hoggard said. 

“Another positive aspect of our method is that it doesn’t require any new kit. You don’t have to put up new satellites or anything like that, we’re just using standard seismic data.  

“It’s also pretty fast, so it’s more or less suitable for real-time monitoring.” 

The research has been published in Geophysical Journal International. 

You may also like

Article Card Image

Mice surprise: researchers discover new native mammal species

Australia can now lay claim to two new species of native rodent thanks to an ANU-led study.

Article Card Image

Monster black hole devouring one sun every day

The fastest-growing black hole ever recorded – devouring the equivalent of one sun every day – has been discovered by ANU researchers.

Article Card Image

World-leading ANU scientists take up key advisory roles

Two exceptional ANU scientists have been appointed to leading Australian science organisations.  

Subscribe to ANU Reporter

Anu Logo

+61 2 6125 5111

The Australian National University, Canberra

CRICOS Provider: 00120C

ABN: 52 234 063 906

EDX Logo
APRU Logo
IARU Logo
Group of eight Australia Logo