@CNN: North Korea’s nuclear test in September was so strong that it caused an on-site collapse at the test site, geologists in China say https://t.co/mQNj7EoMcY https://t.co/Ib1J2WVoQX

@CNN: North Korea’s nuclear test in September was so strong that it caused an on-site collapse at the test site, geologists in China say https://t.co/mQNj7EoMcY https://t.co/Ib1J2WVoQX