Two dams in Kanchanaburi, including the country's largest, were confirmed to be intact following a moderate earthquake and aftershock Thursday.
Prasert Thamrongwisawa, director of the Vajiralongkorn dam, said on Friday that Vajiralongkorn and Srinakarin dams had been checked, found to be sound and that local residents should not be worried.
An earthquake with the magnitude of 4.5 on the Richter scale was detected five kilometres underground in Prang Phlay sub-district of Sangkhla Buri district at 7.10pm on Thursday.
The epicentre was 29.5 kilometres northeast of the Vajiralongkorn dam and 100.3km northwest of the Srinakarin dam. People in Sangkhla Buri and Thong Pha Phum districts felt the quake.
An aftershock measuring 2.1 was detected 4km underground, 30.1km northwest of Vajiralongkorn and 100.3km northwest of Srinakarin at 7.58pm.
Twenty-one patients were evacuated from Sangkhla Buri Hospital Thursday but returned to their wards this morning.
On July 14, quakes measuring 4.8 and 2.0 occurred in Sangkhla Buri district with no damage nor impacts on the dams.
Vajiralongkorn dam has the capacity of 8.8 billion cubic metres of water and Srinakarin, the country's largest dam, has a capacity of 17.7 billion cu/m.