No casualties or damages were immediately reported in the area which was the hardest hit by a Dec. 26, 2004 tsunami triggered by a massive undersea earthquake. The quake did not trigger a tsunami but traumatized residents fled their homes immediately after they felt the jolts. They returned after about an hour.
The U.S. Geological Survey said the two magnitude-5.8 tremors were centered 31 and 35 miles beneath the Indian Ocean, 60 miles southwest of the provincial capital Banda Aceh.
A magnitude-9 earthquake triggered the 2004 tsunami that killed more than 131,000 people in Aceh province and left a half-million homeless.
Indonesia, the world's largest archipelago, is prone to seismic upheaval due to its location on the so-called Pacific "Ring of Fire," an arc of volcanos and fault lines encircling the Pacific Basin.
