Mount Mahameru Outburst in Indonesia Prompts Evacuations

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

The volcano in the province of East Java released blistering plumes of hot ash and a mixture of rock, lava and gas that travelled up to 4 miles down its slopes several times from midday to evening, while a dense plume of hot clouds rose 1.2 miles into the air, according to Indonesia’s Geology Agency.

The outbursts that occurred throughout the day compelled officials to raise the mountain's warning status twice, from the level three to the top level, the agency said. No casualties have been announced.

Over three hundred inhabitants in the three villages most at risk in the district of Lumajang were evacuated to government shelters, according to a representative for the national emergency management body.

He stated that increased activity of the volcano on Wednesday afternoon led officials to widen the hazard area to 8km from the crater. People were urged to keep away from an zone along the Kobokan River, which is the path of the lava flow, as searing gas moved down the volcano's sides.

Footage on social media displayed a dense cloud of volcanic dust moving through a wooded ravine to a waterway beneath a overpass. Locals, some with faces covered with volcanic dust and rain, fled to temporary shelters or departed for other safe areas.

Regional news outlets indicated that emergency teams were facing challenges to save about 178 individuals trapped on the 12,060-foot peak at the Ranu Kumbolo observation station. The group included 137 climbers, 15 porters, 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 stated in a video statement. He noted the post was situated 4.5km from the crater on the north side of the volcano, which is outside the trajectory of the hot cloud flow that was observed traveling to the south-southeast. Inclement conditions and precipitation required the team to remain overnight there, he added.

Semeru, also known as Great Mountain, has erupted many occasions in the last two centuries. Still, as is the situation with many of the 129 active volcanoes in the archipelago, thousands of residents still to reside on its productive highlands.

The mountain's last major eruption was in December 2021, when 51 individuals were lost their lives and several hundred others were injured and villages were submerged in layers of mud. The eruption led to the relocation of more than 10,000 residents from their homes.

The country, an island chain of more than 280 million people, is located along the Pacific “ring of fire”, a curved series of fault lines, and is susceptible to seismic events and volcanism.