The quake was felt by people in tambons Khok Khamin and Pha Noi of Wang Saphung district, tambons Pan Phoem of Pha Khao district, and some areas in Nong Hin district.
There were no reports of casualties or damage.
The epicentre of the quake was about 150 metres from Kwae Noi Bamrung Daen Dam in Phitsanulok.
Asked if the dam had been affected, Mr Bundith, the director of the dam, said the tremor had no effects on the dam, which is designed to withstand a quake of up to 7-magnitude.
Photo credit : www.earthquake.tmd.go.th