Mount Semeru Eruption in Indonesia Prompts Evacuations

Indonesia's Mount Semeru, the tallest summit on Java island, has exploded, covering several villages with falling ash, prompting evacuations and leading authorities to raise the warning to the maximum level.

The mountain in East Java province unleashed 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 noon to evening, while a thick column of hot clouds rose 1.2 miles into the sky, according to the nation's geological authority.

The outbursts that unfolded throughout the day compelled officials to increase the mountain's warning status twice, from the level three to the highest, the agency reported. No deaths or injuries have been reported.

More than 300 residents in the three villages most endangered in the area of Lumajang region were evacuated to government shelters, according to a spokesperson for the national emergency management body.

He stated that heightened volcanic movements of the volcano on Wednesday afternoon led officials to widen the danger zone to 8km from the crater. People were advised to keep away from an area along the Kobokan River, which is the route of the molten rock stream, as searing gas moved down Semeru’s slopes.

Footage on social media showed a dense cloud of ash sweeping through a wooded ravine to a river beneath a bridge. Residents, some with faces smeared with volcanic dust and rain, fled to makeshift refuges or left for other safe areas.

Regional news outlets reported that authorities were facing challenges to save about 178 people stranded on the 3,676-metre peak at the Ranu Kumbolo monitoring post. The group comprised 137 hikers, 15 carriers, seven guides and six tourism officials, according to an official with the national park.

“They remain secure at the Ranu Kumbolo station,” an official stated in a video statement. He said the station was located 4.5km from the crater on the northern slope of the volcano, which is not in the path of the hot cloud flow that was seen moving to the south-southeast. Bad weather and rain required the team to remain overnight there, he explained.

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

The mountain's previous significant explosion was in late 2021, when 51 individuals were lost their lives and hundreds more were burned and villages were submerged in layers of mud. The event led to the relocation of over ten thousand people from their homes.

Indonesia, an island chain of more than 280 million people, is located along the Pacific “ring of fire”, a horseshoe-shaped series of tectonic boundaries, and is prone to seismic events and volcanism.