Indonesian TV showed a smartphone video of a powerful wave hitting Palu with people screaming and running in fear.
Palu’s airport halted operations for 24 hours due to earthquake damage, according to AirNav, which oversees airline traffic in Indonesia.
Central Sulawsi was hit earlier Friday by a magnitude 6.1 earthquake that based on preliminary information killed one person, injured 10 and damaged dozens of houses.
“All the things in my house were swaying and the quake left a small crack on my wall,” Donggala resident Mohammad Fikri said by telephone.
Indonesia is prone to earthquakes because of its location on the “Ring of Fire,” an arc of volcanoes and fault lines in the Pacific Basin.
In December 2004, a massive magnitude 9.1 earthquake off Sumatra in western Indonesia triggered a tsunami that killed 230,000 people in a dozen countries.