An earthquake measuring 6.4 on the Richter scale hit Myanmar at 8.37am on Friday. The quake was about 100 kilometres northwest of Chiang Rai's Mae Sai district.
The earthquake's epicentre was located about 76km southwest of Kengtung township in Shan State, at a depth of nine kilometres.
Three aftershocks with magnitudes of 4.1, 3.5 and 3.4 were recorded shortly after the quake.
The tremor was reportedly felt in Muang, Mae Suay and Mae Sai districts of Chiang Rai; Saraphi and Muang districts of Chiang Mai; Muang district of Lamphun; some parts of Nan; and Lak Si district of Bangkok.
The quake was also felt in Mae Hong Son in the North, as well as Udon Thani and Khon Kaen in the Northeast.
Residents of high-rise buildings as well as staff and patients at Maharaj Nakorn Chiang Mai Hospital said they felt the tremor.
