Two strong tremors were felt in North Korea on Sunday but it was not just an Earthquake. Reports suggest that this what sixth nuclear test from North Korea. North Korean television later revealed it was a hydrogen bomb test intended to be mounted on an ICBM. A tremor as strong a 6.3 magnitude was felt in North Korea because of these testing.
It is believed that the tremors observed were 10 times stronger than the one observed in previous tests by North Korea.