Mount Semeru Eruption in Indonesia Prompts Evacuations

The nation's Mount Semeru, the highest peak 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 the province of East Java released searing clouds of fiery ash and a mixture 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 the nation's geological authority.

The eruptions that occurred throughout the day forced officials to raise the mountain's warning status on two occasions, from the third-highest level to the top level, the agency said. No casualties have been announced.

Over three hundred residents in the three villages most endangered in the district of Lumajang were evacuated to government shelters, according to a representative for the national disaster mitigation agency.

He stated that increased activity of the volcano on the afternoon of Wednesday led authorities to widen the danger zone to 5 miles 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 searing gas moved down the volcano's sides.

Footage on social media showed a dense cloud of ash sweeping through a wooded ravine to a river beneath a overpass. Locals, some with faces covered with volcanic dust and water, fled to temporary shelters or left for alternative secure locations.

Regional news outlets reported that emergency teams were facing challenges to save about 178 people stranded on the 3,676-metre mountain at the Ranu Kumbolo monitoring post. The party included 137 hikers, 15 porters, seven guides and six travel representatives, according to an spokesperson with the protected area.

“They remain secure at the Ranu Kumbolo station,” a spokesperson said in a video statement. He noted the station was located 2.8 miles from the crater on the north side of the mountain, which is outside the trajectory of the hot cloud flow that was seen traveling to the south-southeast. Bad weather and rain forced the group to remain overnight there, he explained.

The volcano, also called Mahameru, has erupted numerous times in the last two centuries. However, as is the situation with many of the 129 live volcanoes in the archipelago, thousands of people continue to live on its productive highlands.

Semeru’s last major eruption was in late 2021, when 51 individuals were lost their lives and several hundred more were injured and villages were submerged in thick mud. The eruption led to the evacuation of more than 10,000 residents from their houses.

Indonesia, an archipelago of more than 280 million people, sits along the Pacific “ring of fire”, a horseshoe-shaped series of fault lines, and is prone to seismic events and volcanism.