Anak Krakatau volcano erupting in the Sunda Straits off the coast of southern Sumatra and the western tip of Java, in this file photo taken on December 23, 2018. Photo: AFP

JAKARTA: Huge chunks of an Indonesian volcano litter the seabed after its eruption and subsequent collapse last year sparked a deadly tsunami, according to new research.

The marine survey imagery shows parts of the strait between Java and Sumatra islands covered with triangular-shaped boulders from the Anak Krakatau volcano, some as high as 90 metres.

The crater partly collapsed after its December 22 eruption with parts of it sliding into the ocean and triggering deadly waves that killed more than 400 people and injured thousands.

The Anak Krakatau volcano emerged at the site of the legendary Krakatoa volcano, which was destroyed after a massive 1883 eruption that killed at least 36,000 people.

The 2018 disaster struck without warning, washing over popular beaches and inundating tourist hotels and coastal communities, leaving a trail of death and destruction in its wake.

Debris from the volcano is spread as far as 2,000 metres from where it collapsed, according to new research presented at the American Geophysical Union’s meeting in San Francisco last week.

Using what’s known as multi beam echo sounder bathymetry, an international team including members of the British Geological Survey, National Oceanography Centre and several US and British universities mapped the seabed with sonar technology. – AFP

Anak Krakatau volcano erupting in the Sunda Straits off the coast of southern Sumatra and the western tip of Java, in this file photo taken on December 23, 2018. Photo: AFP