Pakistan, Aug. 16 -- Rescuers combed through debris for survivors on Saturday after a powerful earthquake struck off Indonesia's eastern Flores island, killing at least 47 people, according to a disaster official.

A second strong quake was recorded thousands of kilometres away on Sumatra island in the west of the archipelago 12 hours later, but there were no initial reports of damage or casualties there.

Rescue official Fathur Rahman said the death toll from the Flores island quake had risen to 47 by Saturday evening, with 50 people injured.

Suharyanto, the head of Indonesia's national disaster mitigation , said earlier that people were trapped in several buildings.

"These will be the initial targets of the disaster response teams," s...