Volcano Semeru Eruption in Indonesia Triggers Evacuations

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

The volcano in the province of East Java unleashed blistering plumes of hot ash and a combination of stone, molten rock, and gases that travelled up to 7km down its slopes several times from noon to dusk, while a dense plume of fiery clouds rose 2km into the sky, according to the nation's geological authority.

The eruptions that occurred throughout the day compelled officials to increase the mountain's warning status twice, from the third-highest level to the highest, the authority reported. No casualties have been reported.

Over three hundred residents in the three villages most endangered in the area of Lumajang region were evacuated to official safe havens, according to a spokesperson for the national emergency management body.

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

Videos on social media displayed a thick plume of ash moving through a wooded ravine to a river beneath a overpass. Locals, some with faces covered with volcanic dust and water, escaped to temporary shelters or departed for alternative secure locations.

Local media indicated 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 comprised 137 climbers, 15 carriers, seven guides and six tourism officials, according to an official with the protected area.

“They remain secure at the Ranu Kumbolo station,” an official said in a video statement. He noted the station 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 rain forced the group to remain overnight there, he explained.

Semeru, also called Great Mountain, has erupted many occasions in the last two centuries. Still, as is the case with numerous of the 129 active volcanoes in Indonesia, thousands of residents continue to reside on its productive highlands.

The mountain's last major eruption was in late 2021, when 51 individuals were killed and several hundred others were burned and settlements were buried in layers of mud. The eruption forced the relocation of over ten thousand residents from their houses.

Indonesia, an archipelago of over 280 million inhabitants, sits along the Pacific “ring of fire”, a curved series of fault lines, and is susceptible to earthquakes and volcanism.