Mount Semeru Outburst in the Southeast Asian nation Triggers Evacuations

Indonesia's Mount Semeru, the highest peak on the island of Java, has exploded, covering several villages with volcanic ash, prompting evacuations and causing officials to elevate the warning to the highest level.

The volcano in East Java province released blistering plumes of hot ash and a combination of rock, lava and gas that travelled up to 4 miles down its sides several times from noon to dusk, while a dense plume of hot clouds rose 2km into the air, according to Indonesia’s Geology Agency.

The outbursts that occurred throughout the day compelled officials to raise the mountain's warning status on two occasions, from the third-highest level to the top level, the authority reported. No casualties have been reported.

More than 300 residents in the three communities most endangered in the district of Lumajang were evacuated to government shelters, according to a representative for the national emergency management body.

He stated that heightened volcanic movements of the mountain on Wednesday afternoon prompted officials to expand the hazard area to 8km from the summit. Residents were urged to keep away from an area along the Besuk Kobokan River, which is the route of the lava flow, as searing gas flowed down Semeru’s slopes.

Videos on online platforms showed a thick plume of volcanic dust moving through a wooded ravine to a waterway beneath a bridge. Locals, some with faces covered with ash and water, fled to temporary shelters or left for alternative secure locations.

Local media indicated that emergency teams were facing challenges to rescue about 178 people trapped on the 3,676-metre mountain at the Ranu Kumbolo monitoring post. The group comprised 137 hikers, 15 carriers, seven guides and six travel representatives, according to an official with the national park.

“They remain secure at Ranu Kumbolo monitoring post,” an official said in a recorded message. He noted the station was located 4.5km from the crater on the northern slope of the volcano, which is outside the trajectory of the fiery cloud movement that was seen traveling to the south-southeast. Bad weather and rain forced the team to spend the night there, he added.

The volcano, also known as Mahameru, has burst many occasions in the past 200 years. Still, as is the situation with numerous of the 129 active volcanoes in the archipelago, thousands of residents still to reside on its fertile slopes.

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

The country, an island chain of over 280 million inhabitants, is located along the Pacific “ring of fire”, a curved series of tectonic boundaries, and is prone to earthquakes and volcanism.