Volcano Mahameru Eruption in the Southeast Asian nation Prompts Evacuations

Indonesia's Mount Semeru, the tallest summit on the island of Java, has exploded, covering several villages with falling ash, prompting evacuations and causing officials to elevate the alert to the maximum level.

The mountain in East Java province released searing clouds of hot ash and a mixture of rock, lava and gas that travelled up to 4 miles down its sides multiple times from midday to dusk, while a thick column of hot clouds rose 2km into the air, according to Indonesia’s Geology Agency.

The outbursts that occurred throughout the day forced officials to raise the volcano’s alert level on two occasions, from the level three to the top level, the authority said. No casualties have been announced.

More than 300 residents in the three communities most at risk in the district of Lumajang region were relocated to official safe havens, according to a spokesperson for the national emergency management body.

He stated that heightened volcanic movements of the volcano on the afternoon of Wednesday prompted officials to widen the danger zone to 8km from the summit. People were advised to stay clear from an zone along the Besuk Kobokan River, which is the path of the molten rock stream, as scorching gases flowed down the volcano's sides.

Videos on social media displayed a thick plume of ash sweeping through a wooded ravine to a river beneath a overpass. Residents, some with faces covered with ash and water, fled to temporary shelters or left for alternative secure locations.

Regional news outlets reported that authorities were facing challenges to rescue about 178 individuals trapped on the 3,676-metre peak at the Ranu Kumbolo observation station. The party comprised 137 climbers, 15 carriers, seven guides and six travel representatives, according to an spokesperson with the national park.

“They remain secure at the Ranu Kumbolo station,” a spokesperson said in a recorded message. He said the station was located 2.8 miles from the summit on the north side of the mountain, which is outside the trajectory of the hot cloud flow that was seen moving to the southeast direction. Bad weather and rain required the team to spend the night there, he added.

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

The mountain's last major eruption was in December 2021, when 51 people were killed and hundreds others were burned and villages were buried in layers of mud. The event led to the relocation of more than 10,000 residents from their houses.

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