An earthquake measuring 6.5 on the Richter scale occurred at 0452 GMT on Friday in Southern Sumatra, Indonesia, the Hong Kong Observatory said, Xinhua reported.
The epicenter was initially determined to be near 3.5 degrees south latitude and 100.4 degrees East longitude, about 290 kilometers south of Padang.
The USGS reported the quake was at 6.3 magnitude with the depth at 25 km under sea bed.
The quake struck at 11:51 a.m. local time with epicenter at 162 km southeast Mentawai island of West Sumatra and with the depth at 83 km sea bed, an official of Indonesian Meteorology and Geophysics Agency told Xinhua by phone.
The intensity of the quake was felt at 3 to 4 MMI (Modified Mercally Intensity) at Padang city, the provincial capital of West Sumatra, the oficial said.
Indonesia is vulnerable on earthquake as it lies on quake-hit zone so called "the Pacific Ring of Fire."