Indonesia tsunami deaths increase after Sumatra quake
Scores of houses were destroyed by waves after the 7.7 magnitude quake, which struck 20km (13 miles) under the ocean floor near the Mentawai islands.
Ten villages on the islands were swept away by the tsunami, a disaster official told the AFP news agency.
Damage and rough weather are delaying efforts to reach the affected area.
Hendri Dori Satoko, a lawmaker in the Mentawai islands, told Metro TV: "Our latest data from crisis centre showed that 108 people have been killed and 502 are still missing."
He said some of the missing could have fled to higher ground and were afraid to return to their homes.
Health ministry officials said 113 bodies had been recovered in the area so far, the Associated Press news agency reported.
The search and rescue operation is being seriously hampered by bad weather, officials have told the BBC's Karishma Vaswani in Jakarta.
Heavy rain is preventing helicopters from accessing the area and boats cannot reach the islands either because the dock on the island of South Pagai has been destroyed.
Poor communications have also made it hard for officials to gain accurate information, our correspondent adds.
The disaster comes as thousands of people are being evacuated from the area around the Mt Merapi volcano in central Java, after it began erupting.
But seismologists say there is very little chance that the two events are connected, Kazinform refers to BBC News.
See www.bbc.co.uk