Mount Mahameru Eruption in Indonesia Prompts Evacuations

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

The mountain in East Java province released blistering plumes of fiery ash and a mixture of rock, lava and gas that moved up to 7km down its slopes several times from noon to dusk, while a dense plume of hot clouds rose 2km into the air, as stated by the nation's geological authority.

The outbursts that unfolded throughout the day compelled officials to raise the mountain's warning status on two occasions, from the level three to the highest, the authority said. No deaths or injuries have been announced.

Over three hundred inhabitants in the three communities most at risk in the area of Lumajang region were relocated to official safe havens, according to a representative for the national emergency management body.

He stated that increased activity of the mountain on Wednesday afternoon prompted officials to widen the danger zone to 8km from the summit. People were advised to stay clear from an area along the Kobokan River, which is the route of the lava flow, as scorching gases moved down the volcano's sides.

Footage on online platforms showed a dense cloud of ash sweeping through a forested valley to a waterway beneath a overpass. Residents, some with faces covered with ash and water, escaped to temporary shelters or left for other safe areas.

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

“They remain secure at the Ranu Kumbolo station,” a spokesperson stated in a recorded message. He said the post was located 4.5km from the summit on the north side of the mountain, which is outside the trajectory of the hot cloud flow that was observed moving to the southeast direction. Inclement conditions and precipitation required the group to spend the night there, he added.

Semeru, also called Great Mountain, has erupted many occasions in the past 200 years. However, as is the situation with many of the 129 live volcanoes in Indonesia, tens of thousands of people still to reside on its fertile slopes.

Semeru’s last major eruption was in December 2021, when 51 individuals were killed and hundreds others were burned and villages were submerged in thick mud. The eruption led to the evacuation of more than 10,000 people from their houses.

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