
The fault that ruptured Monday on Sumatra island's coast also caused the 2004 quake and monster Indian Ocean tsunami that killed 230,000 people in a dozen countries.
Though hundreds of disaster officials were unable to get to many of the villages on the Mentawai islands - reachable only by a 12-hour boat ride - they were preparing for the worst.
"We have 200 body bags on the way, just in case," said Mujiharto, who heads the Health Ministry's crisis center, shortly before announcing a five-fold increase in the death toll.
Indonesia, the world's largest archipelago, is prone to earthquakes and volcanic activity due to its location on the so-called Pacific Ring of Fire - a series of fault lines stretching from the Western Hemisphere through Japan and Southeast Asia.