The massive eruption of Krakatoa killed more than 30,000 people and hurled so much ash that it turned day to night in the area and reduced global temperatures.
Thick ash clouds continued to spew from Anak Krakatau, a volcanic island where a crater collapse at high tide on Saturday sent waves smashing into coastal areas on both sides of the Sunda Strait between the islands of Sumatra and Java.
Meanwhile the continuing eruptions prompted Indonesia to raise the alert level Thursday to the second highest and ordered all flights to steer clear.
At least 16,000 people still remain displaced and rescue workers are struggling to reach remote areas of the country that have been hit by the tsunami.
With Anak Krakatoa still rumbling amid high-tide warnings, many survivors who have been evacuated to higher ground are too afraid to return home, saying they are anxious that another tsunami will strike.
Separately in Aceh province of northern tip of Sumatra Island of western Indonesia on Wednesday, people marked the 14th anniversary of the 2004 Indian Ocean tsunami, which killed some 226,000 people, including 170,000 in Aceh province.
"As the people of Indonesia face disaster for the third time this year, we mourn the tragic loss of life and work to provide an immediate response to care for those who survived the tsunami", said JDC CEO David M. Schizer.
At least 154 people are missing, more than 1,400 people were injured and thousands of people have moved to higher ground.
Thousands of people have taken temporary refuge in shelters like mosques or schools.
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Many of his friends went to hospital with cuts from glass shards after the windows of their hotel broke.
The charity head highlighted that the more crucial part is the post-disaster recovery phase that would build shelter houses and other infrastructure.
"It will be a challenge for us in the future to develop an early tsunami warning system for volcanic activities because we have 127 volcanoes and 13 percent of the world's active volcanoes exist in Indonesia", he said.
The head of meteorological and geophysics agency, BMKG, Dwikorita Karnawati, said the agency anxious about the rough weather making the volcano's crater more fragile.
GlobalGiving, which funnels donations to local organizations, has many options for helping in Indonesia, whether specifically for tsunami and quake recovery, or for other worthy causes like orangutan rescue or saving slow lorises or saving street kids from a life of poverty.
"All these conditions could potentially cause landslides at the cliffs of the crater into the sea, and we fear that that could trigger a tsunami", she said at a news conference.
Indonesia, a vast Southeast Asian archipelago, is one of the most disaster-hit nations on Earth due to its position straddling the so-called Pacific Ring of Fire, where tectonic plates collide.
In 2018, the country has suffered its worst annual death toll from disasters since 2004's devastating tsunami. Later in September, a 7.5 magnitude natural disaster created a tsunami, leaving more than 2,000 dead on the island of Sulawesi, with some reports suggesting the actual number could be closer to 5,000.