Volcano Semeru Eruption in Indonesia Triggers Emergency Relocations

Indonesia's Mount Semeru, the highest peak on Java island, has exploded, covering several villages with volcanic ash, leading to evacuations and causing officials to elevate the alert to the maximum level.

The volcano in East Java province released blistering plumes of fiery ash and a combination of rock, lava and gas that moved up to 7km down its slopes several times from noon to evening, while a thick column of hot clouds rose 2km into the air, as stated by Indonesia’s Geology Agency.

The outbursts that unfolded throughout the day forced authorities to raise the volcano’s alert level twice, from the level three to the top level, the agency said. No casualties have been announced.

More than 300 residents in the three communities most at risk in the district of Lumajang region were relocated to government shelters, as mentioned by a representative for the national disaster mitigation agency.

He said that increased activity of the mountain on the afternoon of Wednesday led officials to expand the danger zone to 5 miles from the crater. Residents were urged to stay clear from an zone along the Kobokan River, which is the route of the molten rock stream, as scorching gases flowed down Semeru’s slopes.

Videos on social media showed a dense cloud of volcanic dust sweeping through a wooded ravine to a waterway beneath a overpass. Locals, some with faces smeared with volcanic dust and rain, fled to makeshift refuges or departed for alternative secure locations.

Regional news outlets indicated that emergency teams were facing challenges to save about 178 people trapped on the 3,676-metre mountain at the Ranu Kumbolo observation station. The group included 137 hikers, 15 porters, seven guides and six travel representatives, according to an spokesperson with the protected area.

“They remain secure at Ranu Kumbolo monitoring post,” an official said in a recorded message. He noted the post was located 2.8 miles from the summit on the northern slope of the mountain, which is outside the trajectory of the hot cloud flow that was observed moving to the southeast direction. Inclement conditions and rain forced the team to remain overnight there, he added.

Semeru, also called Great Mountain, has burst numerous times in the last two centuries. Still, as is the situation with numerous of the 129 live volcanoes in Indonesia, thousands of people still to reside on its productive highlands.

The mountain's last major eruption was in late 2021, when 51 individuals were lost their lives and several hundred more were injured and villages were submerged in thick mud. The event led to the evacuation of more than 10,000 people from their houses.

The country, an island chain of more than 280 million people, is located along the Pacific seismic belt, a horseshoe-shaped series of tectonic boundaries, and is prone to seismic events and volcanic activity.