Jakarta, Sept. 14 -- An earthquake of magnitude 5.4 rocked Nagan Raya District in the westernmost Indonesian province of Aceh on early Monday, according to the Meteorology, Climatology, and Geophysics Agency (BMKG).

The quake, which struck at 1:28 a.m. local time, was centered 43 kilometers southeast of Nagan Raya, at a depth of 125 kilometers, the agency notified on its official website.

The tremor, at Modified Mercalli Intensity (MMI) scale II, was felt by people living as far away as Gunung Sitoli in the neighboring province of North Sumatra.

Mercalli scale is one of the units to assess the strength of an earthquake, especially in the absence of a seismometer at the site, according to the agency.

A quake of MMI I cannot be felt, ex...