Mount Mahameru Outburst in Indonesia Prompts Evacuations

Indonesia's Mount Semeru, the highest peak on Java island, has exploded, blanketing several villages with falling ash, prompting evacuations and leading authorities to raise the alert to the maximum level.

The volcano in the province of East Java unleashed blistering plumes of fiery ash and a combination of rock, lava and gas that travelled up to 7km down its sides several times from midday to dusk, while a dense plume of fiery clouds rose 1.2 miles into the sky, as stated by the nation's geological authority.

The outbursts that occurred throughout the day compelled officials to increase the mountain's warning status twice, from the level three to the highest, the authority reported. No casualties have been reported.

Over three hundred residents in the three villages most at risk in the district of Lumajang were relocated to government shelters, as mentioned by a representative for the national emergency management body.

He said that increased activity of the mountain on the afternoon of Wednesday led officials to widen the hazard area to 5 miles from the summit. People were advised to keep away from an zone along the Besuk Kobokan River, which is the path of the molten rock stream, as searing gas flowed down Semeru’s slopes.

Footage on online platforms showed a dense cloud of volcanic dust sweeping through a forested valley to a river beneath a overpass. Residents, some with faces covered with ash and water, fled to makeshift refuges or departed for other safe areas.

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

“They remain secure at Ranu Kumbolo monitoring post,” an official stated in a recorded message. He noted the station was located 2.8 miles from the crater on the northern slope of the volcano, which is outside the trajectory of the fiery cloud movement that was observed traveling to the southeast direction. Bad weather and precipitation forced the team to remain overnight there, he explained.

Semeru, also called Mahameru, has erupted many occasions in the past 200 years. However, as is the case with many of the 129 live volcanoes in Indonesia, thousands of residents continue to reside on its fertile slopes.

The mountain's last major eruption was in late 2021, when 51 individuals were lost their lives and hundreds more were injured and villages were buried in thick mud. The event led to the relocation of more than 10,000 people from their houses.

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