TODAY |

Indonesia more than doubles danger zone around Anak Krakatau volcano

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 today 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.

The eruption on Sunday 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.

The government has warned communities in the strait to stay a kilometre 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 today, which could give scientists more information about the risks of a second collapse.

Yesterday’s giant wave, triggered by an underwater landslide, slammed the coast with little warning. Source: 1 NEWS

"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."

Sunday'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.

The tsunami comes less than three months after Indonesia was hit by a magnitude .5 earthquake. Source: 1 NEWS

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 vandalised 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.

Indonesia soldier walks near debris at a tsunami-ravaged area in Carita, Indonesia, Wednesday, Dec. 26, 2018. Indonesian authorities asked people to avoid the coast in areas where a tsunami killed hundreds of people last weekend in a fresh warning issued on the anniversary of the catastrophic 2004 Asian earthquake and tsunami. (AP Photo/Achmad Ibrahim)
Indonesian soldiers walk near debris at a tsunami-ravaged area in Carita, Indonesia. Source: Associated Press

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

A man walks near debris at a tsunami-ravaged area in Carita, Indonesia, Wednesday, Dec. 26, 2018. Indonesian authorities asked people to avoid the coast in areas where a tsunami killed hundreds of people last weekend in a fresh warning issued on the anniversary of the catastrophic 2004 Asian earthquake and tsunami. (AP Photo/Achmad Ibrahim)
A man walks near debris at a tsunami-ravaged area in Carita, Indonesia. Source: Associated Press

"I've lost everything I have, my house and all belongings inside it," said farmer Muhamad Sarta.

Volunteers clean the debris on the street following the tsunami in Carita, Indonesia, Wednesday, Dec. 26, 2018. Indonesian authorities asked people to avoid the coast in areas where a tsunami killed hundreds of people last weekend in a fresh warning issued on the anniversary of the catastrophic 2004 Asian earthquake and tsunami. (AP Photo/Achmad Ibrahim)
Volunteers clean the debris on the street following the tsunami in Carita, Indonesia. Source: Associated Press

"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."

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

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.

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

Dave Petley, head of research and innovation at Sheffield University who analysed 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.

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.

At least 429 people died and thousands are displaced after the tsunami struck the country on Sunday. Source: Associated Press