An earthquake with magnitude of 5.9 struck western parts of Indonesia on Monday, but there was no report of damage or casualty, local meteorology agency said, Xinhua reported.
The quake jolted at 12:56 Jakarta time (0556 GMT) with its epicenter at 74 km northeast of Tanahmasa in North Sumatra province and at 21 km under sea bed, an official of the agency, Beni Hendramono, told Xinhua.
The intensity of the quake was felt at 3 to 4 MMI (Modified Mercally Intensity) at Tarutung town and 3 MMI at Sibolga of the province.
Indonesia with over 230 million population sits on a vulnerable quake-hit zone so called the Pacific Ring of Fire, where two continental plates stretching from western hemisphere to Japan meet that cause frequent seismic and volcanic movement.