Volcano Semeru Eruption in Indonesia Triggers Evacuations

Indonesia's Semeru volcano, the highest peak on the island of Java, has erupted, blanketing several villages with falling ash, leading to evacuations and causing officials to elevate the warning to the maximum level.

The mountain in the province of East Java released searing clouds of fiery ash and a combination of stone, molten rock, and gases that travelled up to 4 miles down its slopes several times from midday to dusk, while a dense plume of fiery clouds rose 2km into the air, according to the nation's geological authority.

The outbursts that occurred throughout the day forced officials to raise the volcano’s alert level twice, from the level three to the top level, the agency reported. No deaths or injuries have been announced.

More than 300 residents in the three communities most at risk in the district of Lumajang were evacuated to official safe havens, according to a representative for the national disaster mitigation agency.

He stated that heightened volcanic movements of the mountain on the afternoon of Wednesday prompted authorities to expand the danger zone to 8km from the summit. People were urged to stay clear from an area along the Kobokan River, which is the path of the lava flow, as scorching gases moved down the volcano's sides.

Videos on social media displayed a thick plume of volcanic dust moving through a wooded ravine to a waterway beneath a bridge. Residents, some with faces smeared with ash and rain, escaped to makeshift refuges or departed for alternative secure locations.

Local media reported that emergency teams were facing challenges to save about 178 people stranded on the 3,676-metre mountain at the Ranu Kumbolo observation station. The party included 137 climbers, 15 porters, seven escorts and six tourism officials, according to an official with the protected area.

“They are currently safe at Ranu Kumbolo monitoring post,” a spokesperson said in a video statement. He noted the station was situated 2.8 miles from the summit on the north side of the volcano, which is outside the trajectory of the fiery cloud movement that was observed moving to the south-southeast. Bad weather and rain forced the team to spend the night there, he explained.

Semeru, also called Great Mountain, has burst numerous times in the past 200 years. Still, as is the case with numerous of the 129 active volcanoes in Indonesia, tens of thousands of people continue to live on its fertile slopes.

Semeru’s previous significant explosion was in December 2021, when 51 individuals were lost their lives and hundreds more were injured and settlements were buried in thick mud. The event forced the evacuation of more than 10,000 people from their homes.

Indonesia, an island chain of more than 280 million inhabitants, is located along the Pacific seismic belt, a horseshoe-shaped series of fault lines, and is susceptible to seismic events and volcanism.