Volcano Semeru Eruption in Indonesia Triggers Evacuations

Indonesia's Mount Semeru, the tallest summit on Java island, has exploded, blanketing multiple communities with falling ash, leading to evacuations and leading authorities to raise the alert to the maximum level.

The volcano in East Java province released blistering plumes of hot ash and a mixture of rock, lava and gas that travelled up to 4 miles down its slopes multiple times from midday to dusk, while a thick column of hot clouds rose 1.2 miles into the sky, according to the nation's geological authority.

The outbursts that unfolded throughout the day forced authorities to increase the mountain's warning status on two occasions, from the third-highest level to the top level, the authority reported. No casualties have been reported.

More than 300 inhabitants in the three communities most at risk in the area of Lumajang region were relocated to government shelters, as mentioned by a representative for the national disaster mitigation agency.

He said that heightened volcanic movements of the volcano on the afternoon of Wednesday led officials to expand the danger zone to 5 miles from the summit. People were urged to stay clear from an zone along the Besuk Kobokan River, which is the path of the molten rock stream, as searing gas flowed down Semeru’s slopes.

Videos on social media displayed a thick plume of ash moving through a forested valley to a river beneath a bridge. Locals, some with faces covered with volcanic dust and water, escaped to makeshift refuges or left for other safe areas.

Local media reported that authorities were struggling to rescue about 178 people trapped on the 3,676-metre peak at the Ranu Kumbolo observation station. The group comprised 137 hikers, 15 carriers, seven escorts and six travel representatives, according to an official with the national park.

“They are currently safe at Ranu Kumbolo monitoring post,” an official said in a video statement. He said the post was situated 2.8 miles from the summit on the north side of the mountain, which is outside the trajectory of the fiery cloud movement that was seen traveling to the south-southeast. Inclement conditions and rain required the team to spend the night there, he added.

Semeru, also known as Great Mountain, has burst many occasions in the last two centuries. However, as is the situation with numerous of the 129 active volcanoes in Indonesia, tens of thousands of people continue to live on its productive highlands.

The mountain's previous significant explosion was in late 2021, when 51 people were lost their lives and several hundred more were burned and villages were submerged in thick mud. The eruption forced the relocation of more than 10,000 residents from their houses.

The country, an archipelago of more than 280 million inhabitants, sits along the Pacific “ring of fire”, a curved series of tectonic boundaries, and is prone to earthquakes and volcanism.