Mount Semeru Eruption in Indonesia Triggers Emergency Relocations

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

The volcano in East Java province released blistering plumes of fiery ash and a mixture of stone, molten rock, and gases that moved up to 4 miles down its sides multiple times from midday to dusk, while a thick column of fiery clouds rose 2km into the air, according to Indonesia’s Geology Agency.

The eruptions that unfolded throughout the day forced authorities to raise the volcano’s alert level on two occasions, from the level three to the highest, the agency said. No casualties have been reported.

Over three hundred residents in the three villages most at risk in the district of Lumajang region were evacuated to official safe havens, as mentioned by a spokesperson for the national disaster mitigation agency.

He stated that heightened volcanic movements of the volcano on Wednesday afternoon led officials to expand the hazard area to 5 miles from the summit. Residents were urged to keep away from an area along the Kobokan River, which is the route of the molten rock stream, as scorching gases flowed down Semeru’s slopes.

Videos on online platforms showed a thick plume of ash sweeping through a wooded ravine to a river beneath a overpass. Locals, some with faces covered with volcanic dust and water, fled to makeshift refuges or left for alternative secure locations.

Local media reported that emergency teams were facing challenges to save about 178 people trapped on the 3,676-metre peak at the Ranu Kumbolo observation station. The group comprised 137 climbers, 15 porters, seven escorts and six travel representatives, according to an official with the national park.

“They remain secure at Ranu Kumbolo monitoring post,” a spokesperson stated in a recorded message. He noted the station was situated 2.8 miles from the summit on the northern slope of the volcano, which is not in the path of the hot cloud flow that was seen traveling to the southeast direction. Inclement conditions and rain forced the team to spend the night there, he added.

Semeru, also known as Great Mountain, has erupted many occasions in the past 200 years. However, as is the situation with many of the 129 live volcanoes in the archipelago, tens of thousands of people still to live on its productive highlands.

Semeru’s previous significant explosion was in late 2021, when 51 people were killed and several hundred others were burned and settlements were buried in layers of mud. The eruption forced the relocation of more than 10,000 residents from their houses.

The country, an island chain of more than 280 million inhabitants, is located along the Pacific seismic belt, a horseshoe-shaped series of fault lines, and is susceptible to seismic events and volcanic activity.