Volcano Semeru Outburst in Indonesia Triggers Evacuations

The nation's Mount Semeru, the highest peak on the island of Java, has exploded, covering several villages with falling ash, prompting evacuations and causing officials to elevate the warning to the maximum level.

The mountain in East Java province released blistering plumes of hot ash and a mixture of stone, molten rock, and gases that moved up to 7km down its sides multiple times from midday to evening, while a thick column of fiery clouds rose 2km into the air, as stated by Indonesia’s Geology Agency.

The eruptions that unfolded throughout the day compelled authorities to increase the mountain's warning status twice, from the third-highest level to the highest, the authority said. No deaths or injuries have been reported.

More than 300 residents in the three communities most endangered in the district of Lumajang were relocated to government shelters, as mentioned by a representative for the national emergency management body.

He said that heightened volcanic movements of the volcano on Wednesday afternoon prompted authorities to widen the danger zone to 8km from the crater. Residents were advised to keep away from an area along the Kobokan River, which is the path of the lava flow, as searing gas flowed down Semeru’s slopes.

Footage on social media displayed a dense cloud of ash moving through a wooded ravine to a waterway beneath a overpass. Locals, some with faces covered with ash and water, escaped to makeshift refuges or left for other safe areas.

Local media indicated that authorities were facing challenges to save about 178 people trapped on the 3,676-metre mountain at the Ranu Kumbolo observation station. The group included 137 hikers, 15 porters, seven escorts and six travel representatives, according to an official with the national park.

“They remain secure at Ranu Kumbolo monitoring post,” an official stated in a recorded message. He said the station was located 4.5km from the crater on the northern slope of the mountain, which is outside the trajectory of the fiery cloud movement that was observed moving to the southeast direction. Bad weather and rain required the team to spend the night there, he added.

The volcano, also called Great Mountain, has erupted many occasions in the last two centuries. Still, as is the situation with numerous of the 129 live volcanoes in Indonesia, tens of thousands of people still to reside on its productive highlands.

Semeru’s last major eruption was in December 2021, when 51 people were killed and several hundred others were burned and villages were submerged in layers of mud. The eruption forced the relocation of more than 10,000 residents from their houses.

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