Mount Semeru Eruption in Indonesia Triggers Evacuations

Indonesia's Mount Semeru, the highest peak on Java island, has exploded, covering multiple communities with falling ash, leading to evacuations and leading authorities to raise the warning to the maximum level.

The mountain in East Java province released searing clouds of fiery ash and a combination of rock, lava and gas that moved up to 7km down its sides several times from midday to evening, 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 compelled authorities to raise the volcano’s alert level twice, from the third-highest level to the top level, the authority said. No deaths or injuries have been reported.

Over three hundred residents in the three villages most endangered in the district of Lumajang were relocated to government shelters, according to a spokesperson for the national disaster mitigation agency.

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 crater. Residents were advised to stay clear from an area along the Kobokan River, which is the path of the lava flow, as scorching gases flowed down the volcano's sides.

Footage on online platforms displayed a dense cloud of ash moving through a forested valley to a waterway beneath a bridge. Residents, some with faces smeared with ash and rain, escaped to makeshift refuges or departed for alternative secure locations.

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

“They remain secure at the Ranu Kumbolo station,” a spokesperson said in a recorded message. He said the post was situated 4.5km from the summit on the north side of the mountain, which is outside the trajectory of the hot cloud flow that was seen moving to the southeast direction. Bad weather and precipitation required the team to remain overnight there, he added.

The volcano, also known as Great Mountain, has erupted many occasions in the last two centuries. Still, as is the situation with many of the 129 active volcanoes in Indonesia, tens of thousands of residents still to live on its productive highlands.

The mountain's previous significant explosion was in late 2021, when 51 people were lost their lives and hundreds more were injured and villages were submerged in layers of mud. The eruption forced the evacuation of over ten thousand residents from their homes.

The country, an archipelago of over 280 million inhabitants, sits along the Pacific seismic belt, a curved series of fault lines, and is prone to earthquakes and volcanism.