LABUAN, Indonesia: Indonesia on Thursday raised the alert level for the erupting Anak Krakatau volcano to the second-highest, and ordered all flights to steer clear, days after it triggered a tsunami that killed at least 430 people.
A crater collapse on the volcanic island at high tide on Saturday sent waves up to 5 meters (16 feet) high smashing into the coast on the Sunda Strait, between the islands of Java and Sumatra.
Authorities have warned that the crater of Anak Krakatau, or child of Krakatau, remains fragile, raising fears of another collapse and tsunami, and have urged residents to stay away from the coast.
The volcano has been rumbling on and off since July but has been particularly active since Sunday, spewing lava and rocks, and sending huge clouds of ash up to 3,000 meters into heavily overcast skies.
The national geological agency, in raising the alert level to the second-highest, set a 5-km exclusion zone around the island.
“Since December 23, activity has not stopped … We anticipate a further escalation,” said Antonius Ratdomopurbo, secretary of the geological agency.
A thin layer of volcanic ash has been settling on buildings, vehicles and vegetation along the west coast of Java since late on Wednesday, according to images shared by the national disaster mitigation agency.
Authorities said the ash was not dangerous, but advised residents to wear masks and goggles when outside, while aircraft were ordered away.
The civil aviation authority said no airports would be affected. The capital, Jakarta, is about 155 km east of the volcano.
Tsunami warning systems were set up after 2004 but they have failed to prevent subsequent disasters, often because apparatus has not been maintained properly, while public education and disaster preparation efforts have been patchy at best. Nearly 22,000 people were displaced by the tsunami, while 1,495 were injured and 159 are missing.
Most of the displaced are staying in crowded shelters.
Aid is getting through and the government has declared a state of emergency until Jan. 4, to help with the distribution of assistance.
