Casualty figures from Saturday night's disaster continued to rise, with at least 281 people confirmed killed and more than 1,000 injured.
The powerful tsunami swept over popular beaches on southern Sumatra and western Java and inundated tourist hotels and coastal settlements.
Rescue teams used their bare hands, diggers and other heavy equipment to haul debris from the stricken area around the Sunda Strait, as thousands were evacuated to higher ground.
A view of Banten, Indonesia, on December 24, following the tsunami.
Ben van der Pluijm, an quake geologist and a professor in the University of MI, said the tsunami may have been caused by a "partial collapse" of Anak Krakatau.
The Indonesian Medical Association said that it sent doctors, medical supplies and equipment, and that numerous injured were in need of orthopedic and neurological surgery.
The tsunami struck at 21:30 local time (14:30 GMT) during a local holiday, with few of the warning signals that might have come had it been generated by an natural disaster. Doctors worked to save injured victims while hundreds of military and volunteers scoured debris-strewn beaches in search of survivors Monday after a deadly tsunami gushed ashore without warning on Indonesian islands on a busy holiday weekend.
"The likelihood of further tsunamis in the Sunda Strait will remain high while Anak Krakatoa volcano is going through its current active phase because that might trigger further submarine landslides", Teeuw said.
A tsunami following a volcanic eruption hit Indonesia, leaving 222 people dead on Saturday night, officials said Sunday.
At least 373 people have died, with 128 missing and almost 1,500 wounded, according to Sutopo Purwo Nugroho, a spokesman for Indonesia's disaster management agency.
Indonesian Tsunami's Death Toll Rises to 222 as 848 People Are Injured & 28 People Are Missing
Indonesia, which sits on the Pacific "Ring of Fire", has suffered its worst annual death toll from disasters in more than a decade.
At least three members of the popular band Seventeen have died after a tsunami swept through a Southeast Indonesia beach where they were performing.
On 26 December 2004, a series of huge waves triggered by a powerful quake in the Indian Ocean killed about 228,000 people in 13 countries, mostly in Indonesia.
Anak Krakatau had been spewing ash and lava for months before a 64-hectare section of its south-west side collapsed, said Dwikorita Karnawati, the head of the meteorological agency.
Sutopo said on Twitter: "Anak Krakatau has been erupting since June 2018 until now", he said.
"This is like suddenly dropping a bag of sand in a tub filled with water."
Scientists said Sunday that the tsunami could have been caused by undersea landslides or those occurring above sea level on the volcano's steep outside slope following the eruption. According to media reports, over 200 people have been killed as a result of the disaster, while more than 800 others sustained injuries and some 30 went missing.
Anak Krakatau is the island that emerged from an area once occupied by Krakatau, which was completely destroyed in the 1883 disaster.
Despite the devastating 2004 Boxing Day tsunami that killed hundreds of thousands of people, Indonesia lacks proper equipment to warn of an incoming tsunami threat.
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