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Indonesia expands no-go zone around island volcano

WATCH: All flights are being ordered to steer clear of Indonesia's Anak Krakatau volcano as the country has raised its alert level to the second-highest possible after a landslide on the mountain caused a deadly tsunami.

Indonesia raised the danger level for an island volcano that triggered a tsunami on the weekend, killing at least 430 people in Sumatra and Java, and widened its no-go zone.

The country’s volcanology agency said Thursday that the Anak Krakatau volcano’s alert status had been raised to the second-highest level and the exclusion zone more than doubled to a 5-kilometre radius.

READ MORE: Tsunami recovery efforts in Indonesia slow amid new ‘extreme weather’ warning

The eruption on Saturday evening caused part of the island in the Sunda Strait to collapse into the sea, apparently generating tsunami waves of more than 2 metres. Most tsunamis are caused by earthquakes.

WATCH: Authorities warn that volcano that triggered tsunami in Indonesia could unleash another one

Authorities warn that volcano that triggered tsunami in Indonesia could unleash another one
Authorities warn that volcano that triggered tsunami in Indonesia could unleash another one
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The government has warned communities in the strait to stay a kilometer (6/10 of a mile) away from the coastline because of the risk of another tsunami triggered by Krakatau’s eruptions. A navy vessel is expected to pass by the island later Thursday, which could give scientists more information about the risks of a second collapse.

WATCH: Indonesia’s recovery mission on grim anniversary

Indonesia’s recovery mission on grim anniversary
Indonesia’s recovery mission on grim anniversary

“There’s still a chance of a landslide, even under the sea level or on the sea level,” said Rudy Sunendar, head of the energy ministry’s geology department.

“We don’t know exactly because we are not yet gone to the field” due to bad weather, he told The Associated Press at the volcano’s monitoring post. “Based on the satellite imagery interpretation, there is collapse of some area of Mount Anak Krakatau.”

WATCH BELOW: Aerial footage shows devastation caused by Indonesia tsunami

Aerial footage shows scale of damage from Indonesia tsunami
Aerial footage shows scale of damage from Indonesia tsunami

Saturday’s disaster struck without warning, surprising people in a country that regularly suffers landslides, earthquakes and volcanic eruptions. No big earthquake shook the ground beforehand, and the waves surged inland at night on a holiday weekend while people were enjoying concerts and other beachside activities.

WATCH BELOW: Possible extreme weather threatens recovery efforts in Indonesia

Possible extreme weather creates new danger as Indonesia recovers from tsunami
Possible extreme weather creates new danger as Indonesia recovers from tsunami
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Indonesia’s tsunami warning system relies on land seismometers and buoys connected to tidal gauges and is not equipped to detect underwater landslides. The system, in any case, has not operated for years because the buoys have been vandalized or not maintained because of low funding.

Heavy rains and high seas have hampered the search for victims. Some bodies were found at sea and at least 159 people are missing.

WATCH BELOW: Tsunami wave hits while band performs in Indonesia

Video appears to show tsunami hit as Indonesia pop band performs
Video appears to show tsunami hit as Indonesia pop band performs

On Thursday, residents of badly affected Banten province on Java island were searching through the debris of destroyed or damaged homes for anything salvageable.

“I’ve lost everything I have, my house and all belongings inside it,” said farmer Muhamad Sarta.

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“I just hope for some help from the government,” he said. “Hopefully there will be some repairs. I have nowhere to go. I have no money. Whatever I had was lost in the water.”

WATCH BELOW: Smoke rises from Anak Krakatau one day after deadly tsunami

Video captures smoke rising from Indonesia volcano day after deadly tsunami
Video captures smoke rising from Indonesia volcano day after deadly tsunami

Radar data from satellites, converted into images, shows Anak Krakatau shrunk dramatically following Saturday’s eruption.

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Satellite photos aren’t available because of cloud cover but radar images from a Japan Aerospace Exploration Agency satellite taken before and after the eruption show the volcano’s southwestern flank has disappeared.

This combination of synthetic aperture radar images taken by JAXA’s ALOS-2 satellite and analyzed by Geospatial Information Authority of Japan shows Indonesia’s Anak Krakatau volcano, center in images, before and after the Dec. 22, 2018, eruption.
This combination of synthetic aperture radar images taken by JAXA’s ALOS-2 satellite and analyzed by Geospatial Information Authority of Japan shows Indonesia’s Anak Krakatau volcano, center in images, before and after the Dec. 22, 2018, eruption. Geospatial Information Authority of Japan via AP

JAXA’s post-eruption image shows concentric waves radiating from the island, which experts say is caused by its ongoing eruptions.

READ MORE: Italy’s Mount Etna eruption triggered a 4.8 earthquake and injured at least 10

Dave Petley, head of research and innovation at Sheffield University who analyzed similar images from a European Space Agency satellite, said they support the theory that a landslide, most of it undersea, caused the tsunami.

“The challenge now is to interpret what might be happening on the volcano, and what might happen next,” he wrote in a blog.

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WATCH: Drone footage shows devastating impact of tsunami in Indonesia

Drone footage shows devastating impact of tsunami in Indonesia
Drone footage shows devastating impact of tsunami in Indonesia

Anak Krakatau, which means Child of Krakatau, is the offspring of the infamous Krakatau volcano that affected the global climate with a massive eruption in 1883.

Anak Krakatau first rose above sea level in 1929, according to Indonesia’s volcanology agency, and has been increasing its land mass since then.

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