Why a seismologist tweeted the F-bomb after North Korea's nuclear testThis undated file photo distributed on Sunday, Sept. 3, 2017, by the North Korean government, shows North Korean leader Kim Jong-n, second from right, at an undisclosed location in North Korea. - Steven Gibbons, NORSAR seismologist"They have claimed that before, in January 2016," Gibbons said. But this time, he said, the evidence suggests North Korea is doing more than the usual sabre rattling. Ground motion is a great indicator of an underground nuclear test, and sometimes the only one. North Korea has proven itself adept at masking other telltale signs, such as the leakage of radioactive materials.

Source: CBC News September 04, 2017 21:38 UTC