Japan has raised its estimate of the explosive yield of North Korea's sixth nuclear test to 160 kilotons, 10 times the force of the atomic bomb dropped on Hiroshima in 1945, Defense Minister Itsunori Onodera said Wednesday."This is vastly greater than previous North Korean nuclear tests. We cannot rule out the possibility that this was a hydrogen bomb test," Onodera told reporters."(North Korea) is evolving not just their ballistic missiles but also their nuclear technology," he said.Satellite photo around north korea's nuclear test site (Supplied by Planet / 38 North)(Planet / 38 North)Onodera said the new estimate is based on definitive seismic data from a commission promo…READ FULL ARTICLE