Houses were swallowed up when the quake caused soil to liquefy, the national rescue agency said.
At least 1,400 people are confirmed to have been killed by the disaster.
But those who survived described "a wave of mud" carrying their homes more than a mile from where it once stood.
ITV News Senior International Correspondent John Irvine visited the site in Sigi where homes and families were washed away
Among those killed were 34 Indonesian students, their bodies were found under a church, buried by the mudslide.
They were among a group of 86 students reported missing from a Bible camp in the Jonooge Church Training Centre.
The whereabouts of the other 52 students are not known.
There are fears some survivors may still be trapped under the rubble of that and other buildings.