Small N. Korea quake likely natural, not nuclear test: Experts
Small N. Korea quake likely natural, not nuclear test: Experts
China’s Earthquake Administration said the quake was not a nuclear explosion and had the characteristics of a natural tremor. The administration had said earlier the magnitude 3.4 quake detected at 08:29 GMT was a “suspected explosion.”
The CTBTO, or Comprehensive Test-Ban Treaty Organization, which monitors nuclear tests, and officials of the South Korean meteorological agency said they believed it was a natural quake.
The Pentagon and the US State Department did not immediately respond to requests for comment
A US intelligence official and US-based non-governmental experts said their initial assessment was that the quake was either natural or connected to North Korea’s latest and largest nuclear test on Sept. 3, and not caused by a new nuclear test.
“It seems likely that these small tremors are related to the shifts in the ground due to the recent large test,” said David Wright of the Union of Concerned Scientists in the US.
The seismic activity came just hours before North Korea’s Foreign Minister Ri Yong-ho, who warned on Thursday that North Korea could consider a hydrogen bomb test of an unprecedented scale over the Pacific, was due to address the UN General Assembly in New York.
Ri did not respond when asked by reporters whether North Korea had conducted a new nuclear test.
A US government intelligence analyst said the events could have been a “mine-type” collapse of tunnels damaged by North Korea’s previous nuclear test, but was more likely a small earthquake.
An official of South Korea’s Meteorological Agency said acoustic waves should be detected in the event of a man-made earthquake.
“In this case we saw none. So as of now, we are categorizing this as a natural earthquake.”
The earthquake, which South Korea’s Meteorological Agency put at magnitude 3, was detected 49 km from Kilju in North Hamgyong Province, where North Korea’s known Punggye-ri nuclear site is located, the official said.
All of North Korea’s six nuclear tests registered as earthquakes of magnitude 4.3 or above. The last test registered as a 6.3 magnitude quake.
A secondary tremor detected after that test could have been caused by the collapse of a tunnel at the mountainous site, experts said at the time. Satellite photos of the area after the Sept. 3 quake showed numerous landslides apparently caused by the massive blast, which North Korea said was an advanced hydrogen bomb.
The head of the international nuclear test monitoring agency CTBTO said on Saturday that analysts were “looking at unusual seismic activity of a much smaller magnitude” than the Sept. 3 test in North Korea.
“Two #Seismic Events! 0829UTC & much smaller @ 0443UTC unlikely Man-made! Similar to “collapse” event 8.5 mins after DPRK6! Analysis ongoing,” CTBTO Executive Secretary Lassina Zerbo said in a Twitter post, referring to the Sept. 3 test.
Russia’s Emergency Ministry says background radiation in nearby Vladivostok was within the natural range.
The US Geological Survey (USGS) said it could not conclusively confirm whether the quake, which it measured at magnitude 3.5, was man-made or natural.
“The depth is poorly constrained and has been held to 5 km by the seismologist,” USGS said.
Jeffrey Lewis, head of the East Asia Nonproliferation Program at the Middlebury Institute of Strategic Studies at Monterey, California, said: “Seismologists are very good at discriminating between earthquakes and explosions. I see no reason to doubt that it was an earthquake.”
There was no immediate reaction from China’s Foreign Ministry, but the news was widely reported by Chinese state media outlets and on social media.
Tensions have continued to rise around the Korean Peninsula since Pyongyang carried out its sixth nuclear test, prompting a new round of UN sanctions.
US President Donald Trump called the North Korean leader a “madman” on Friday, a day after Kim dubbed him a “mentally deranged US dotard” who would face the “highest level of hard-line countermeasure in history.”
Kim was responding to a speech by Trump at the UN General Assembly in which Trump said the US would “totally destroy” North Korea if it threatened the US or its allies.
On Thursday, Trump announced new US sanctions that he said allows the targeting of companies and institutions that finance and facilitate trade with North Korea.
Earlier on Saturday, China said it will limit exports of refined petroleum products from Oct. 1 and ban exports of condensates and liquefied natural gas immediately to comply with the latest UN sanctions. It will also ban imports of textiles from North Korea.
North Korea’s nuclear tests to date have all been underground, and experts say an atmospheric test, which would be the first since one by China in 1980, would be proof of the success of its weapons program.
North Korea has launched dozens of missiles this year, several of them flying over Japan, as it accelerates a weapons program aimed at enabling it to target the United States with a nuclear-tipped missile.
No indication North Korea nuclear activities stopped: UN watchdog
- ‘The continuation and further development of the DPRK’s nuclear program and related statements by the DPRK are a cause for grave concern’
- The watchdog has stepped up monitoring through open source information and satellite imagery
VIENNA: The UN’s nuclear watchdog said it had not seen any indication that nuclear activities in North Korea have stopped despite its pledges to denuclearize.
“The continuation and further development of the DPRK’s nuclear program and related statements by the DPRK are a cause for grave concern,” said a report by the International Atomic Energy Agency (IAEA), referring to North Korea’s official name.
The report, published late Monday, by the director general of Yukiya Amano is to be submitted to an IAEA board meeting in September.
In 2009 Pyongyang expelled IAEA inspectors from its Yongbyon nuclear site and has since refused to allow IAEA inspections on its territory.
The watchdog has stepped up monitoring through open source information and satellite imagery, it said.
“As the Agency remains unable to carry out verification activities in the DPRK, its knowledge of the DPRK’s nuclear program is limited and, as further nuclear activities take place in the country, this knowledge is declining,” it said.
Between late-April and early-May, there were indications of the operation of the steam plant that serves the radiochemical laboratory at the Yongbyon site, according to the report.
However, the duration of the steam plant’s operation was not sufficient to have supported the reprocessing of a complete core from the experimental nuclear power plant reactor, it added.
North Korea’s leader Kim Jong Un and US President Donald Trump held a groundbreaking summit in Singapore in June.
At the meeting the pair struck a vague agreement to denuclearize the Korean peninsula, but there has been little movement since.
Before this, Kim met South Korean President Moon Jae-in in April for their first summit. They agreed to push for a declaration of an end to the Korean War this year.