Volcano Mahameru Eruption in Indonesia Triggers Evacuations

The nation's Semeru volcano, the highest peak on the island of Java, has erupted, covering multiple communities with volcanic ash, prompting evacuations and causing officials to elevate the warning to the maximum level.

The volcano in East Java province unleashed blistering plumes of hot ash and a combination of rock, lava and gas that travelled up to 4 miles down its sides multiple times from midday to evening, while a thick column of hot clouds rose 1.2 miles into the sky, according to Indonesia’s Geology Agency.

The eruptions that unfolded throughout the day compelled authorities to increase the volcano’s alert level on two occasions, from the third-highest level to the top level, the agency reported. No deaths or injuries have been reported.

Over three hundred inhabitants in the three villages most at risk in the district of Lumajang were evacuated to government shelters, according to a spokesperson for the national disaster mitigation agency.

He said that increased activity of the mountain on the afternoon of Wednesday led authorities to expand the danger zone to 8km from the crater. People were urged to stay clear from an area along the Besuk Kobokan River, which is the route of the lava flow, as scorching gases moved down the volcano's sides.

Footage on social media displayed a thick plume of ash sweeping through a forested valley to a waterway beneath a bridge. Residents, some with faces covered with volcanic dust and rain, fled to makeshift refuges or departed for other safe areas.

Local media indicated that emergency teams were struggling to rescue about 178 individuals stranded on the 12,060-foot mountain at the Ranu Kumbolo observation station. The party included 137 hikers, 15 carriers, seven guides and six tourism officials, according to an spokesperson with the protected area.

“They remain secure at the Ranu Kumbolo station,” an official stated in a recorded message. He said the station was situated 2.8 miles 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. Inclement conditions and rain forced the team to spend the night there, he explained.

The volcano, 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 the archipelago, tens of thousands of residents still to live on its fertile slopes.

Semeru’s last major eruption was in December 2021, when 51 people were killed and several hundred more were burned and settlements were buried in layers of mud. The eruption forced the relocation of over ten thousand residents from their homes.

The country, an archipelago of more than 280 million inhabitants, sits along the Pacific “ring of fire”, a horseshoe-shaped series of tectonic boundaries, and is susceptible to seismic events and volcanism.