Volcano Mahameru Outburst in Indonesia Triggers Emergency Relocations

Indonesia's Semeru volcano, the highest peak on Java island, has erupted, covering several villages with falling ash, prompting evacuations and causing officials to elevate the warning to the maximum level.

The volcano in East Java province unleashed searing clouds of hot ash and a combination of rock, lava and gas that travelled up to 7km down its slopes multiple times from noon to dusk, while a dense plume of fiery clouds rose 2km into the air, as stated by the nation's geological authority.

The eruptions that occurred throughout the day compelled authorities to increase the volcano’s alert level twice, from the level three to the top level, the authority said. No deaths or injuries have been announced.

More than 300 residents in the three villages most endangered in the district of Lumajang region were evacuated to official safe havens, according to a representative for the national disaster mitigation agency.

He said that heightened volcanic movements of the volcano on Wednesday afternoon prompted officials to expand the danger zone to 8km from the summit. Residents were urged to stay clear from an zone along the Besuk Kobokan River, which is the route of the molten rock stream, as searing gas moved down the volcano's sides.

Videos on online platforms showed a thick plume of volcanic dust sweeping through a forested valley to a waterway beneath a overpass. Residents, some with faces covered with volcanic dust and water, escaped to makeshift refuges or departed for other safe areas.

Regional news outlets reported that authorities were facing challenges to rescue about 178 people trapped on the 12,060-foot peak at the Ranu Kumbolo monitoring post. The group included 137 hikers, 15 carriers, seven escorts and six travel representatives, according to an official with the protected area.

“They remain secure at the Ranu Kumbolo station,” an official said in a video statement. He said the station was situated 2.8 miles from the summit on the northern slope of the volcano, which is outside the trajectory of the fiery cloud movement that was seen traveling to the southeast direction. Bad weather and precipitation required the team to remain overnight there, he added.

The volcano, also called Great Mountain, has erupted numerous times in the last two centuries. However, as is the situation with many of the 129 live volcanoes in Indonesia, tens of thousands of people still to reside on its productive highlands.

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

Indonesia, an archipelago 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.