At least 844 people are confirmed to have died but that figure is expected to rise sharply as more remote areas are reached.
The authorities have said they will begin burying victims in mass graves, fearing disease could begin to spread.
Dozens of people are thought to be trapped alive under the rubble.
In Palu, rescuers are awaiting heavy machinery to search the ruins of a hotel and a shopping centre as aftershocks made it unsafe for them to go in.
“Communication is limited, heavy machinery is limited… it’s not enough for the numbers of buildings that collapsed,” said Sutopo Purwo Nugroho, spokesman for the National Disaster Mitigation Agency.
Islamic Appeal are assessing the current situation in Indonesia.
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