Has China tested a new nuclear warheads that has caused a magnitude 6.2 earthquake?

Has China tested a new nuclear warheads that has caused a magnitude 6.2 earthquake? Spotlight on China — "Strange occurrences before the Gansu earthquake According to official Chinese media, at 23:59 on February 18, an earthquake with a magnitude of 6.2 on the Richter scale occurred in Jishishan C