JAKARTA, Feb. 2 (Xinhua) -- A shallow earthquake with a revised magnitude of 6.1 rocked West Sumatra province of western Indonesia on Saturday, but was not potential for tsunami, the meteorology and geophysics agency said.

There were no initial reports of damages or casualty after the main shock, according to the national disaster management agency.

The meteorology agency said earlier that the quake was at 6.0 magnitude before revising it to 6.1, Agung M. Utomo, official in charge of the agency told Xinhua.

The main shock struck at 4:27 p.m. Jakarta time (0927 GMT) with the epicenter at 117 km southeast of Mentawai Island and a depth of 17 km under sea bed, he said.

The intensity of the quake was felt strongly at 4 MMI (Modified Mercalli Intensity) in provincial capital of Padang and Pariaman town, Agung said.

About 59 minutes later, a strong aftershock measuring 6.0 magnitude with a depth of 18 km jolted the province, he said, adding that a 5.3 magnitude fore shock struck 24 minutes before the main shock.

There were no initial reports of damages or casualty triggered by the jolts, Sutopo Purwo Nugroho, spokesman of national disaster management agency told Xinhua.