The 7.5 magnitude quake, with an epicenter about 50 miles north of Palu, was just six miles deep. A tsunami later caused damage in two cities, according to Indonesian officials.
A Japanese news outlet is reporting at least 53 people were injured and another 20 have been reported missing. Officials fear people are trapped inside homes wiped out by a landslide.
Damaging aftershocks continue to shake the island of Lombak, which suffered a deadly earthquake on Sunday. Rescue workers are struggling to reach the injured in some remote areas.
At least 82 people are dead after a 7.0 magnitude earthquake struck the northern part of the island on Sunday. It's the second powerful quake in a week to hit the region.
The temblor caused severe damage to roads, bursting water mains and setting fires across the prefecture. Crumbling concrete walls killed two people, while another was struck by a bookshelf.
More than 1,700 people have evacuated from a neighborhood on Hawaii's Big Island following a volcanic eruption last week. Ground fissures continue to spew lava and gas into residential neighborhoods.
The U.S. Geological Survey simulated a 7.0 magnitude earthquake on the Hayward Fault near Oakland, Calif., and found that such a quake could kill hundreds and cause more than $100 billion in damage.
A 7.5 magnitude earthquake struck in the country's isolated interior on Monday, triggering landslides. Days later, rescuers are still working to reach some remote communities.