Mount Semeru Eruption in the Southeast Asian nation Prompts Evacuations

The nation's Mount Semeru, the tallest summit on Java island, has erupted, covering multiple communities with falling ash, prompting evacuations and causing officials to elevate the alert to the highest level.

The volcano in the province of East Java released blistering plumes of fiery ash and a mixture of rock, lava and gas that moved up to 4 miles down its sides multiple times from noon to dusk, while a dense plume of fiery clouds rose 1.2 miles into the sky, according to Indonesia’s Geology Agency.

The eruptions that occurred throughout the day forced authorities to increase the mountain's warning status on two occasions, from the level three to the top level, the authority said. No deaths or injuries have been reported.

Over three hundred inhabitants in the three villages most endangered in the district of Lumajang region were evacuated to official safe havens, as mentioned by a representative for the national disaster mitigation agency.

He said that heightened volcanic movements of the mountain on the afternoon of Wednesday led officials to widen the hazard area to 8km from the crater. People were urged to keep away from an area along the Besuk Kobokan River, which is the path of the lava flow, as scorching gases flowed down Semeru’s slopes.

Footage on social media showed a thick plume of ash moving through a forested valley to a waterway beneath a bridge. Locals, some with faces smeared with ash and water, escaped to makeshift refuges or departed for alternative secure locations.

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 party included 137 hikers, 15 carriers, seven escorts and six travel representatives, 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 said the post was located 4.5km from the crater on the north side of the volcano, which is not in the path of the fiery cloud movement that was observed traveling to the southeast direction. Bad weather and rain forced the team to remain overnight there, he added.

The volcano, also called Mahameru, has erupted many occasions in the past 200 years. Still, as is the case with numerous of the 129 active volcanoes in the archipelago, tens of thousands of people still to live on its fertile slopes.

Semeru’s last major eruption was in December 2021, when 51 people were lost their lives and hundreds more were injured and settlements were submerged in thick mud. The eruption forced the evacuation of more than 10,000 residents from their houses.

The country, an archipelago of over 280 million inhabitants, sits along the Pacific seismic belt, a horseshoe-shaped series of fault lines, and is prone to seismic events and volcanic activity.