On 3 September 2017 , the country 's state media reported that a hydrogen bomb test was conducted which resulted in " perfect success " . According to the U.S. Geological Survey ( USGS ) , the blast resulted in an earthquake with a magnitude of 6.3 , 10 times more powerful than previous nuclear tests conducted by North Korea . U.S. Intelligence released an early assessment that the yield estimate was 140 kilotons , with an uncertainty range of 70 to 280 kilotons
hydrogen bomb test
2017 North Korean nuclear test
Thermonuclear weapon