JAKARTA, Sept. 15 (Xinhua) -- A 5.7-magnitude under-land earthquake struck off Indonesia's western North Sumatra province on Sunday, the country's meteorology and geophysics agency said.
The tremors occurred at 04:37 a.m. Jakarta time (2137 GMT Saturday) with its epicenter being 17 km southwest of North Tapanuli (Tapanuli Utara) regency at a depth of 131 km under-earth, the agency reported.
The quake's intensity registered at III MMI (Modified Mercalli Intensity) in Central Tapanuli (Tapanuli Tengah) regency and Gunungsitoli town, it said.
Indonesia is prone to earthquakes as the archipelagic country lies in a vulnerable quake-stricken zone called "the Pacific Ring of Fire." ■