Mount Mahameru Eruption in Indonesia Prompts Emergency Relocations

The nation's Mount Semeru, the highest peak on the island of Java, has exploded, blanketing multiple communities with volcanic ash, leading to evacuations and causing officials to elevate the warning to the highest level.

The mountain in East Java province released blistering plumes of fiery ash and a combination 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 fiery clouds rose 2km into the sky, according to Indonesia’s Geology Agency.

The outbursts that unfolded throughout the day forced authorities to raise the mountain's warning status twice, from the level three to the highest, the agency reported. No casualties have been announced.

More than 300 inhabitants in the three communities most at risk in the district of Lumajang region were relocated to government shelters, as mentioned by a spokesperson for the national disaster mitigation agency.

He said that heightened volcanic movements of the mountain on the afternoon of Wednesday prompted officials to widen the hazard area to 5 miles from the crater. Residents were advised to keep away from an area along the Besuk Kobokan River, which is the route of the lava flow, as scorching gases moved down the volcano's sides.

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

Regional news outlets reported that emergency teams were struggling to save about 178 individuals stranded on the 3,676-metre mountain at the Ranu Kumbolo observation station. The group comprised 137 climbers, 15 porters, seven guides and six travel representatives, according to an spokesperson with the national park.

“They are currently safe at Ranu Kumbolo monitoring post,” a spokesperson said in a video statement. He said the station was situated 2.8 miles from the crater on the north side of the mountain, which is outside the trajectory of the fiery cloud movement that was observed traveling to the south-southeast. Bad weather and precipitation required the group to spend the night there, he added.

Semeru, also called Great Mountain, has erupted many occasions in the past 200 years. Still, as is the situation with many of the 129 live volcanoes in Indonesia, tens of thousands of residents continue to live on its fertile slopes.

The mountain's previous significant explosion was in late 2021, when 51 individuals were killed and hundreds more were burned and settlements were buried in layers of mud. The eruption forced the evacuation of more than 10,000 residents from their houses.

The country, an island chain 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.

Bryan Wilson
Bryan Wilson

Award-winning photographer and educator passionate about helping others find beauty through the lens.