National Disaster Mitigation Agency spokesperson Raditya Jati said floods brought by intense rains caused floodwaters as high as 3 metres.

More than 600 people were injured during the magnitude 6.2 quake, which sent people fleeing their homes in the darkness.

A team of divers recovered one of the plane’s so-called black boxes, the flight data recorder (FDR), from the seabed earlier this week.

The devices were buried in seabed mud under tons of sharp objects in the plane's wreckage, navy Chief Adm. Yudo Margono said.

More than a dozen helicopters, 53 navy ships and 20 boats, and 2,600 rescue personnel have been searching since Sunday and have found parts of the plane in the water.

Indonesia's aviation record is one of the worst in Asia, with more civilian airliner passenger accidents since 1945 than any other country in the region.

``Hopefully we can lift the black boxes in short time to determine the cause of the crash,'' military chief Hadi Tjahjanto said.

The AP's investigation into child labour is part of a broader in-depth look at the industry that also exposed rape, forced labour trafficking and slavery.

The mountains are among more than 120 active volcanoes in Indonesia, which is prone to seismic upheaval due to its location on the Pacific 'Ring of Fire.'

The Regional Comprehensive Economic Partnership, or RCEP, was signed virtually on Sunday on the sidelines of the annual summit of the 10-nation Association of Southeast Asian Nations.