Nearly 100 killed, hundreds hurt as quake strikes Indonesia
Nugroho said more than 1,000 personnel, including military officers and volunteers, had been deployed to help in disaster relief.
The U.S. Geological Survey said the quake struck just after 5 a.m. (2200 GMT Tuesday) at a depth of 17 km (11 miles). No tsunami warning was issued.
At least five aftershocks were felt after the initial quake, the disaster management agency said.
The region suffered massive destruction in 2004 when a 9.2 magnitude quake triggered a tsunami that wiped out entire communities in Indonesia and other countries around the Indian Ocean.
Indonesia was the hardest hit, with more than 120,000 people killed in Aceh.