Mount Semeru Eruption in the Southeast Asian nation Triggers Emergency Relocations

The nation's Mount Semeru, the tallest summit on the island of Java, has erupted, covering several villages with falling ash, prompting evacuations and leading authorities to raise the warning to the maximum level.

The volcano in the province of East Java unleashed blistering plumes of hot ash and a mixture of stone, molten rock, and gases that travelled up to 7km down its slopes several times from midday to dusk, while a thick column of hot clouds rose 2km into the sky, according to Indonesia’s Geology Agency.

The eruptions that unfolded throughout the day compelled authorities to increase the volcano’s alert level on two occasions, from the third-highest level to the highest, the agency reported. No deaths or injuries have been reported.

More than 300 residents in the three communities most at risk in the area of Lumajang region were evacuated to government shelters, as mentioned by a spokesperson for the national emergency management body.

He said that increased activity of the volcano on the afternoon of Wednesday led authorities to expand the hazard area to 8km from the crater. Residents were urged to keep away from an zone along the Kobokan River, which is the route of the lava flow, as scorching gases flowed down Semeru’s slopes.

Footage on online platforms showed a dense cloud of volcanic dust sweeping through a forested valley to a river beneath a overpass. Locals, some with faces covered with volcanic dust and water, escaped to makeshift refuges or left for other safe areas.

Regional news outlets indicated that emergency teams were facing challenges to save about 178 individuals stranded on the 3,676-metre peak at the Ranu Kumbolo observation station. The group comprised 137 hikers, 15 porters, seven guides and six tourism officials, according to an spokesperson with the national park.

“They are currently safe at Ranu Kumbolo monitoring post,” an official said in a video statement. He noted the station was located 4.5km from the summit on the north side of the volcano, which is outside the trajectory of the fiery cloud movement that was seen moving to the southeast direction. Inclement conditions and rain required the group to spend the night there, he explained.

The volcano, also known as Mahameru, has erupted many occasions in the last two centuries. However, as is the situation with numerous of the 129 active volcanoes in Indonesia, tens of thousands of residents continue to reside on its fertile slopes.

The mountain's previous significant explosion was in December 2021, when 51 individuals were killed and several hundred others were injured and villages were submerged in thick mud. The eruption led to the relocation of more than 10,000 people from their homes.

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 earthquakes and volcanic activity.