Mount Semeru Eruption in Indonesia Prompts Evacuations

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

The mountain in East Java province unleashed blistering plumes of hot ash and a mixture of rock, lava and gas that travelled up to 4 miles down its slopes multiple times from midday to dusk, while a dense plume of fiery clouds rose 1.2 miles into the air, according to Indonesia’s Geology Agency.

The eruptions that unfolded throughout the day forced officials to raise the volcano’s alert level on two occasions, from the third-highest level to the highest, the authority reported. No deaths or injuries have been reported.

More than 300 residents in the three communities most endangered in the district of Lumajang region were relocated to official safe havens, according to a representative for the national emergency management body.

He said that increased activity of the volcano on Wednesday afternoon prompted officials to widen the hazard area to 5 miles from the summit. Residents were advised to stay clear from an area along the Kobokan River, which is the path of the lava flow, as searing gas moved down the volcano's sides.

Videos on online platforms showed a dense cloud of volcanic dust sweeping through a wooded ravine to a waterway beneath a overpass. Residents, some with faces covered with volcanic dust and rain, escaped to temporary shelters or left for other safe areas.

Regional news outlets reported that authorities were facing challenges to save about 178 individuals trapped on the 12,060-foot peak at the Ranu Kumbolo monitoring post. The party included 137 hikers, 15 porters, seven guides and six travel representatives, according to an spokesperson with the national park.

“They are currently safe at Ranu Kumbolo monitoring post,” an official stated in a recorded message. He noted the station was situated 4.5km from the summit on the north side of the mountain, which is outside the trajectory of the fiery cloud movement that was seen moving to the southeast direction. Bad weather and precipitation required the group to remain overnight there, he added.

The volcano, also called Great Mountain, has erupted numerous times in the past 200 years. However, as is the case with numerous of the 129 active volcanoes in Indonesia, thousands of residents still to reside on its productive highlands.

Semeru’s last major eruption was in December 2021, when 51 individuals were killed and several hundred others were injured and villages were submerged in layers of mud. The event forced the relocation of over ten thousand people from their homes.

Indonesia, an island chain of over 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.