Mount Mahameru Outburst in Indonesia Triggers Evacuations

The nation's Semeru volcano, the highest peak on Java island, has erupted, covering several villages with falling ash, prompting evacuations and leading authorities to raise the warning to the highest level.

The volcano in East Java province released searing clouds of hot ash and a mixture of rock, lava and gas that moved up to 7km down its sides multiple times from midday to dusk, while a dense plume of fiery clouds rose 2km into the sky, according to Indonesia’s Geology Agency.

The outbursts that unfolded throughout the day forced officials to raise the volcano’s alert level twice, from the level three to the highest, the agency said. No deaths or injuries have been announced.

Over three hundred inhabitants in the three communities most endangered in the district of Lumajang were evacuated to government shelters, as mentioned by a representative for the national disaster mitigation agency.

He stated that heightened volcanic movements of the mountain on the afternoon of Wednesday led officials to widen the danger zone to 8km from the crater. People were advised to stay clear from an area along the Besuk Kobokan River, which is the route of the molten rock stream, as searing gas moved down Semeru’s slopes.

Videos on online platforms showed a thick plume of ash moving through a forested valley to a waterway beneath a bridge. Residents, some with faces covered with volcanic dust and rain, escaped to temporary shelters or departed for alternative secure locations.

Local media indicated that authorities were facing challenges to rescue about 178 individuals trapped on the 12,060-foot peak at the Ranu Kumbolo observation station. The group included 137 hikers, 15 porters, seven escorts and six travel representatives, according to an spokesperson with the protected area.

“They are currently safe at Ranu Kumbolo monitoring post,” a spokesperson said in a video statement. He said the post was situated 2.8 miles from the summit on the northern slope of the volcano, which is outside the trajectory of the hot cloud flow that was seen traveling to the southeast direction. Inclement conditions and rain forced the team to remain overnight there, he explained.

The volcano, also called Mahameru, has erupted many occasions in the last two centuries. However, as is the case with numerous of the 129 live volcanoes in Indonesia, thousands of residents still to live on its fertile slopes.

Semeru’s previous significant explosion was in December 2021, when 51 people were killed and several hundred more were injured and villages were buried in thick mud. The event forced the evacuation of more than 10,000 people from their houses.

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