Mount Semeru Eruption in Indonesia Prompts Evacuations

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

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

The outbursts that occurred throughout the day forced authorities to increase the volcano’s alert level twice, from the third-highest level to the highest, the agency reported. No casualties have been announced.

Over three hundred inhabitants in the three villages most endangered in the area of Lumajang region were relocated to government shelters, as mentioned by a spokesperson for the national emergency management body.

He said that increased activity of the mountain on the afternoon of Wednesday prompted authorities to widen the hazard area to 8km from the summit. Residents were advised to keep away from an area along the Kobokan River, which is the path of the molten rock stream, as scorching gases moved down the volcano's sides.

Videos on online platforms showed a thick plume of volcanic dust sweeping through a forested valley to a river beneath a overpass. Locals, some with faces smeared with volcanic dust and rain, fled to temporary shelters or left for other safe areas.

Regional news outlets indicated that authorities were struggling to save about 178 individuals trapped on the 3,676-metre mountain at the Ranu Kumbolo monitoring post. The party comprised 137 climbers, 15 carriers, seven guides and six travel representatives, according to an official with the national park.

“They remain secure at Ranu Kumbolo monitoring post,” an official said in a video statement. He said the post was located 4.5km from the crater on the north side of the mountain, which is outside the trajectory of the hot cloud flow that was seen moving to the southeast direction. Bad weather and rain required the group to remain overnight there, he added.

Semeru, also called Great Mountain, has erupted numerous times in the past 200 years. Still, as is the situation with numerous of the 129 live volcanoes in the archipelago, tens of thousands of residents still to live on its productive highlands.

Semeru’s previous significant explosion was in late 2021, when 51 people were lost their lives and hundreds more were burned and villages were buried in layers of mud. The eruption led to 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 “ring of fire”, a curved series of fault lines, and is susceptible to seismic events and volcanic activity.