The bureau said the quake occurred at 3.34am with its epicentre about 254 kilometres northwest of Mae Hong Son's Muang district. The quake happened at a depth of 10 kilometres.
The bureau also reported that another 2.5-magnitude quake happened at the depth of 10 kilometres at the Myanmar-China border, about 162 kilometres northwest of Chiang Rai, at 6.34pm on Wednesday.