The Seismological Bureau of the Meteorological Department reported that the first quake was centred seven kilometres underground in Phan district with the magnitude of 2.5 at 12.04am.
At 4.04am another shake of 2.4 magnitude occurred four kilometres underground in the same district.
At 9.14am, a 2.6 tremor occurredthree kilometres underground in Mae Lao district.
Two earlier tremors were recorded in Phan district - a 2.2-magnitude shake one kilometre underground at 6.30pm on June 17 and a 2.5 shake five kilometres underground at 4.35am on June 18.
In the evening of May 5 the biggest inland quake recorded in Thailand was centred about seven kilometres under Mae Lao district of Chiang Rai. The earthquake damaged many buildings, resulting in the death of one person and injuries to 24 others.