Mount Semeru Eruption in Indonesia Prompts Evacuations

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

The mountain in East Java province unleashed blistering plumes of hot ash and a mixture of rock, lava and gas that travelled up to 7km down its slopes several times from noon to dusk, while a thick column of fiery clouds rose 2km into the sky, as stated by the nation's geological authority.

The outbursts that unfolded throughout the day compelled authorities to increase the mountain's warning status twice, from the third-highest level to the top level, the agency reported. No casualties have been reported.

More than 300 inhabitants in the three villages most endangered in the district of Lumajang region were relocated to official safe havens, according to a representative for the national disaster mitigation agency.

He stated that heightened volcanic movements of the volcano on the afternoon of Wednesday prompted authorities to widen the danger zone to 5 miles from the summit. People were advised to keep away from an area along the Besuk Kobokan River, which is the path of the lava flow, as searing gas flowed down Semeru’s slopes.

Footage on social media displayed a thick plume of volcanic dust moving through a forested valley to a waterway beneath a bridge. Locals, some with faces smeared with volcanic dust and water, escaped to temporary shelters or left for alternative secure locations.

Local media indicated that emergency teams were facing challenges to rescue about 178 individuals trapped on the 12,060-foot peak at the Ranu Kumbolo observation station. The party comprised 137 hikers, 15 porters, seven guides and six travel representatives, according to an official with the protected area.

“They are currently safe at Ranu Kumbolo monitoring post,” a spokesperson said in a video statement. He said the station was located 2.8 miles from the summit on the northern slope of the mountain, which is outside the trajectory of the fiery cloud movement that was seen traveling to the southeast direction. Inclement conditions and precipitation required the group to remain overnight there, he added.

Semeru, also known as Mahameru, has burst numerous times in the last two centuries. Still, as is the case with many of the 129 active volcanoes in Indonesia, tens of thousands of residents continue to reside on its fertile slopes.

The mountain's last major eruption was in December 2021, when 51 people were killed and hundreds more were burned and settlements were buried in layers of mud. The eruption forced the evacuation of over ten thousand people from their houses.

The country, an island chain of over 280 million inhabitants, sits along the Pacific “ring of fire”, a curved series of fault lines, and is susceptible to earthquakes and volcanic activity.