Chinese scientists say North Korea nuclear site collapsed

Kim Jong Un was willing to move mountains to develop his nuclear weapons, though doing so may have lead to the stop in his testing program.

North Korea announced last weekend that it would no longer carry out missile or nuclear tests, with its leader saying that the quest for weapons of mass destruction was “complete.”

However, research by Chinese geologists suggests that the previous tests had caused the mountain above the main testing site to collapse, perhaps offering another motive for the apparent gesture of good faith.

25 PHOTOS
Satellite images of the Punggye-ri nuclear test site in North Korea
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Satellite images of the Punggye-ri nuclear test site in North Korea
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - APRIL 2, 2017. Figure 1. Activity continues at the North Portal. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - APRIL 2, 2017. Figure 2. Possible new dumping observed at the North Portal spoil pile. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - APRIL 2, 2017. Figure 3. Probable personnel in formation or equipment in rows at the Main Administrative Area. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - MARCH 30, 2017. Figure 1. No vehicles or trailers remain around the North Portal but well-worn paths are observed. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - MARCH 30, 2017. Figure 2. No new dumping of material on the North Portal spoil pile. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - MARCH 30, 2017. Figure 3. Small collection of crates or trailers seen in previous imagery has been removed. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - MARCH 28, 2017. Figure 3B. Formations seen in the Main Administrative Area, similar to what was seen in lead up to 2013 nuclear test. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - MARCH 28, 2017. Figure 2. Material dumped at the North Portal tailings pile. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - JANUARY 4, 2013. Figure 3A. Formations seen in the Main Administrative Area in lead up to 2013 nuclear test. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - MARCH 28, 2017. Figure 1. Continued activity at the North Portal. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - MARCH 25, 2017. Figure 1. Probable cabling and water drainage seen at the North Portal. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - OCTOBER 19th, 2016: Figure 6: Excavation continued underground in the North Portal area suggesting more tests to come in the same tunnel complex directly under Mt. Mantap. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - JANUARY 5th, 2017: Figure 7: The North Portal spoil pile continued to expand into 2017, becoming increasingly broader. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - JANUARY 22nd, 2017: Figure 8: Late January 2017 imagery showing new spoil on top of recent snow. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - OCTOBER 19th, 2016: Figure 9. A close-up of the North Portal spoil pile as it appeared in late October 2016. The unstable spoil can sometimes lead to accidents, as in this case of toppled rail cars downslope. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - FEBRUARY 12th, 2017: Figure 10. A close-up of the North Portal spoil pile from February 2017 shows that accumulations had begun move westward with a broadening of the top and bottom west side of the pile. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - MARCH 7th, 2017: Figure 1. DigitalGlobe imagery showing large shipping container or crate seen at the North Portal. Date: March 7, 2017. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - MARCH 7th, 2017: Figure 2. DigitalGlobe imagery showing no changes to pattern and texture of tailings (spoil) pile at the North Portal. Date: March 7, 2017. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - MARCH 7th, 2017: Figure 3. DigitalGlobe imagery showing a small vehicle present at the West Portal. Date: March 7, 2017. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - MARCH 7th, 2017: Figure 4. DigitalGlobe imagery showing a truck present in the southern courtyard of the Main Administrative Area. Date: March 7, 2017. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - MARCH 7th, 2017: Figure 5. DigitalGlobe imagery showing a truck present at the sites Command Center. Date: March 7, 2017. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - MARCH 7th, 2017: Figure 6. DigitalGlobe imagery showing snow cleared at guard barrack and security checkpoint. Date: March 7, 2017. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - OCTOBER 24, 2016: Figure 2. No activity seen at the Sohae launch pad. Date: October 24, 2016. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - OCTOBER 24, 2016: Figure 3. Environmental shed remains adjacent to the vertical engine test stand. (Photo DigitalGlobe/38 North via Getty Images)
PUNGGYE-RI NUCLEAR TEST SITE, NORTH KOREA - OCTOBER 29, 2016: Figure 1C. Increased activity around the North Portal throughout October. Date: October 29, 2016. (Photo DigitalGlobe/38 North via Getty Images)
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Geologists at the University of Science and Technology of China said in a paper that an earthquake created an “onsite collapse toward the nuclear test center” shortly after the testing of a bomb in September with the force 100 kilotons worth of TNT.

Beyond the first 6.3 magnitude quake, the test, North Korea’s sixth, is believed to have caused four more earthquakes in the following weeks.

The paper is slated for publication in Geophysical Research Letters, and looks at the problem of leaking radioactive material as well as the the nuke-triggered earthquakes that have caused evacuations on the other side of the nearby Chinese border.

12 PHOTOS
Kim Jong Un watches launch of Hwansong-15 missile in North Korea
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Kim Jong Un watches launch of Hwansong-15 missile in North Korea
This photo taken on November 29, 2017 and released on November 30, 2017 by North Korea's official Korean Central News Agency (KCNA) shows North Korean leader Kim Jong-Un looking at launching of the Hwansong-15 missile which is capable of reaching all parts of the US. THIS PICTURE WAS MADE AVAILABLE BY A THIRD PARTY. AFP CAN NOT INDEPENDENTLY VERIFY THE AUTHENTICITY, LOCATION, DATE AND CONTENT OF THIS IMAGE. THIS PHOTO IS DISTRIBUTED EXACTLY AS RECEIVED BY AFP. / AFP PHOTO / KCNA via KNS AND AFP PHOTO / KCNA VIA KNS / South Korea OUT / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT 'AFP PHOTO / KCNA VIA KNS / BYLINE' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS (Photo credit should read KCNA VIA KNS/AFP/Getty Images)
North Korea's leader Kim Jong Un is seen as the newly developed intercontinental ballistic rocket Hwasong-15� test was successfully launched, in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang November 30, 2017. REUTERS/KCNA ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. SOUTH KOREA OUT. NO THIRD PARTY SALES. NOT FOR USE BY REUTERS THIRD PARTY DISTRIBUTORS
This photo taken on November 29, 2017 and released on November 30, 2017 by North Korea's official Korean Central News Agency (KCNA) shows launching of the Hwansong-15 missile which is capable of reaching all parts of the US. THIS PICTURE WAS MADE AVAILABLE BY A THIRD PARTY. AFP CAN NOT INDEPENDENTLY VERIFY THE AUTHENTICITY, LOCATION, DATE AND CONTENT OF THIS IMAGE. THIS PHOTO IS DISTRIBUTED EXACTLY AS RECEIVED BY AFP. / AFP PHOTO / KCNA via KNS AND AFP PHOTO / KCNA VIA KNS / South Korea OUT / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT 'AFP PHOTO / KCNA VIA KNS / BYLINE' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS (Photo credit should read KCNA VIA KNS/AFP/Getty Images)
This photo taken on November 29, 2017 and released on November 30, 2017 by North Korea's official Korean Central News Agency (KCNA) shows launching of the Hwansong-15 missile which is capable of reaching all parts of the US. THIS PICTURE WAS MADE AVAILABLE BY A THIRD PARTY. AFP CAN NOT INDEPENDENTLY VERIFY THE AUTHENTICITY, LOCATION, DATE AND CONTENT OF THIS IMAGE. THIS PHOTO IS DISTRIBUTED EXACTLY AS RECEIVED BY AFP. / AFP PHOTO / KCNA via KNS AND AFP PHOTO / KCNA VIA KNS / South Korea OUT / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT 'AFP PHOTO / KCNA VIA KNS / BYLINE' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS (Photo credit should read KCNA VIA KNS/AFP/Getty Images)
This photo taken on November 29, 2017 and released on November 30, 2017 by North Korea's official Korean Central News Agency (KCNA) shows the Hwansong-15 missile which is capable of reaching all parts of the US. THIS PICTURE WAS MADE AVAILABLE BY A THIRD PARTY. AFP CAN NOT INDEPENDENTLY VERIFY THE AUTHENTICITY, LOCATION, DATE AND CONTENT OF THIS IMAGE. THIS PHOTO IS DISTRIBUTED EXACTLY AS RECEIVED BY AFP. / AFP PHOTO / KCNA via KNS AND AFP PHOTO / KCNA VIA KNS / South Korea OUT / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT 'AFP PHOTO / KCNA VIA KNS / BYLINE' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS (Photo credit should read KCNA VIA KNS/AFP/Getty Images)
This photo taken on November 29, 2017 and released on November 30, 2017 by North Korea's official Korean Central News Agency (KCNA) shows launching of the Hwansong-15 missile which is capable of reaching all parts of the US. THIS PICTURE WAS MADE AVAILABLE BY A THIRD PARTY. AFP CAN NOT INDEPENDENTLY VERIFY THE AUTHENTICITY, LOCATION, DATE AND CONTENT OF THIS IMAGE. THIS PHOTO IS DISTRIBUTED EXACTLY AS RECEIVED BY AFP. / AFP PHOTO / KCNA via KNS AND AFP PHOTO / KCNA VIA KNS / South Korea OUT / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT 'AFP PHOTO / KCNA VIA KNS / BYLINE' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS (Photo credit should read KCNA VIA KNS/AFP/Getty Images)
This photo taken on November 29, 2017 and released on November 30, 2017 by North Korea's official Korean Central News Agency (KCNA) shows launching of the Hwansong-15 missile which is capable of reaching all parts of the US. THIS PICTURE WAS MADE AVAILABLE BY A THIRD PARTY. AFP CAN NOT INDEPENDENTLY VERIFY THE AUTHENTICITY, LOCATION, DATE AND CONTENT OF THIS IMAGE. THIS PHOTO IS DISTRIBUTED EXACTLY AS RECEIVED BY AFP. / AFP PHOTO / KCNA via KNS AND AFP PHOTO / KCNA VIA KNS / South Korea OUT / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT 'AFP PHOTO / KCNA VIA KNS / BYLINE' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS (Photo credit should read KCNA VIA KNS/AFP/Getty Images)
This photo taken on November 29, 2017 and released on November 30, 2017 by North Korea's official Korean Central News Agency (KCNA) shows North Korean leader Kim Jong-Un looking at launching of the Hwansong-15 missile which is capable of reaching all parts of the US. THIS PICTURE WAS MADE AVAILABLE BY A THIRD PARTY. AFP CAN NOT INDEPENDENTLY VERIFY THE AUTHENTICITY, LOCATION, DATE AND CONTENT OF THIS IMAGE. THIS PHOTO IS DISTRIBUTED EXACTLY AS RECEIVED BY AFP. / AFP PHOTO / KCNA via KNS AND AFP PHOTO / KCNA VIA KNS / South Korea OUT / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT 'AFP PHOTO / KCNA VIA KNS / BYLINE' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS (Photo credit should read KCNA VIA KNS/AFP/Getty Images)
This photo taken on November 29, 2017 and released on November 30, 2017 by North Korea's official Korean Central News Agency (KCNA) shows North Korean leader Kim Jong-Un looking at launching of the Hwansong-15 missile which is capable of reaching all parts of the US. THIS PICTURE WAS MADE AVAILABLE BY A THIRD PARTY. AFP CAN NOT INDEPENDENTLY VERIFY THE AUTHENTICITY, LOCATION, DATE AND CONTENT OF THIS IMAGE. THIS PHOTO IS DISTRIBUTED EXACTLY AS RECEIVED BY AFP. / AFP PHOTO / KCNA via KNS AND AFP PHOTO / KCNA VIA KNS / South Korea OUT / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT 'AFP PHOTO / KCNA VIA KNS / BYLINE' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS (Photo credit should read KCNA VIA KNS/AFP/Getty Images)
This photo taken on November 29, 2017 and released on November 30, 2017 by North Korea's official Korean Central News Agency (KCNA) shows the Hwansong-15 missile which is capable of reaching all parts of the US. THIS PICTURE WAS MADE AVAILABLE BY A THIRD PARTY. AFP CAN NOT INDEPENDENTLY VERIFY THE AUTHENTICITY, LOCATION, DATE AND CONTENT OF THIS IMAGE. THIS PHOTO IS DISTRIBUTED EXACTLY AS RECEIVED BY AFP. / AFP PHOTO / KCNA via KNS AND AFP PHOTO / KCNA VIA KNS / South Korea OUT / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT 'AFP PHOTO / KCNA VIA KNS / BYLINE' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS (Photo credit should read KCNA VIA KNS/AFP/Getty Images)
This photo taken on November 29, 2017 and released on November 30, 2017 by North Korea's official Korean Central News Agency (KCNA) shows North Korean leader Kim Jong-Un looking at launching of the Hwansong-15 missile which is capable of reaching all parts of the US. THIS PICTURE WAS MADE AVAILABLE BY A THIRD PARTY. AFP CAN NOT INDEPENDENTLY VERIFY THE AUTHENTICITY, LOCATION, DATE AND CONTENT OF THIS IMAGE. THIS PHOTO IS DISTRIBUTED EXACTLY AS RECEIVED BY AFP. / AFP PHOTO / KCNA via KNS AND AFP PHOTO / KCNA VIA KNS / South Korea OUT / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT 'AFP PHOTO / KCNA VIA KNS / BYLINE' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS (Photo credit should read KCNA VIA KNS/AFP/Getty Images)
A view of the newly developed intercontinental ballistic rocket Hwasong-15� test that was successfully launched, in this undated photo released by North Korea's Korean Central News Agency (KCNA) in Pyongyang November 30, 2017. REUTERS/KCNA ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THIS IMAGE. SOUTH KOREA OUT. NO THIRD PARTY SALES. NOT FOR USE BY REUTERS THIRD PARTY DISTRIBUTORS
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Kim's statement that his hermit kingdom would give up its headline-grabbing tests comes after rounds of sanctions were implemented by the international community including China, a crucial trading partner.

The strongman is set to meet Moon Jae-in, the president of South Korea, in a historic summit in the border village of Panmunjom this Friday that is expected to discuss denuclearization.

President Trump is also scheduled to meet with Kim, who has said that giving up nuclear weapons must be tied to U.S. troops leaving his southern neighbor, in late May or early June.

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