Mount Semeru Eruption in Indonesia Triggers Evacuations

The nation's Mount Semeru, the tallest summit on the island of Java, has erupted, blanketing several villages with falling ash, prompting evacuations and causing officials to elevate the alert to the maximum level.

The mountain in the province of East Java unleashed searing clouds of fiery ash and a combination of stone, molten rock, and gases 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, according to the nation's geological authority.

The outbursts that unfolded throughout the day forced officials to raise the mountain's warning status twice, from the third-highest level to the top level, the authority reported. 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, as mentioned by a spokesperson for the national disaster mitigation agency.

He stated that increased activity of the volcano on Wednesday afternoon prompted officials to expand the hazard area to 5 miles from the summit. Residents were advised to stay clear from an zone along the Kobokan River, which is the route of the lava flow, as searing gas flowed down Semeru’s slopes.

Videos on online platforms showed a thick plume of volcanic dust moving through a wooded ravine to a waterway beneath a overpass. Residents, some with faces smeared with ash and rain, escaped to makeshift refuges or departed for other safe areas.

Regional news outlets indicated that authorities were facing challenges to save about 178 people trapped on the 12,060-foot mountain at the Ranu Kumbolo monitoring post. The party comprised 137 climbers, 15 carriers, seven guides and six tourism officials, according to an spokesperson with the protected area.

“They are currently safe at the Ranu Kumbolo station,” a spokesperson stated in a video statement. He noted the post was located 4.5km from the crater on the north side of the volcano, which is not in the path of the hot cloud flow that was seen traveling to the south-southeast. Bad weather and precipitation forced the group to remain overnight there, he added.

The volcano, also known as Mahameru, has burst numerous times in the last two centuries. Still, as is the case with many of the 129 live volcanoes in the archipelago, thousands of people continue to live on its fertile slopes.

Semeru’s last major eruption was in December 2021, when 51 people were lost their lives and several hundred more were injured and settlements were submerged in layers of mud. The event forced the evacuation of over ten thousand people from their houses.

The country, an archipelago of over 280 million people, sits along the Pacific “ring of fire”, a curved series of fault lines, and is susceptible to seismic events and volcanism.