Volcano Mahameru Eruption in the Southeast Asian nation Prompts Emergency Relocations

Indonesia's Mount Semeru, the tallest summit on the island of Java, has erupted, covering several villages with volcanic ash, prompting evacuations and causing officials to elevate the alert to the highest level.

The volcano in the province of East Java released searing clouds of hot ash and a combination of stone, molten rock, and gases that travelled up to 7km down its sides several times from midday to dusk, while a dense plume of fiery clouds rose 2km into the sky, as stated by Indonesia’s Geology Agency.

The outbursts that unfolded throughout the day compelled officials to increase the volcano’s alert level twice, from the third-highest level to the highest, the agency said. No casualties have been reported.

Over three hundred inhabitants in the three villages most endangered in the area of Lumajang were evacuated to government shelters, according to a representative for the national emergency management body.

He said that increased activity of the volcano on the afternoon of Wednesday prompted authorities to expand the danger zone to 8km from the crater. Residents were advised to keep away from an zone along the Kobokan River, which is the path of the lava flow, as scorching gases flowed down the volcano's sides.

Videos on online platforms showed a dense cloud of volcanic dust moving through a wooded ravine to a river beneath a bridge. Residents, some with faces covered with volcanic dust and water, fled to temporary shelters or left for alternative secure locations.

Local media indicated that authorities were struggling to rescue about 178 individuals trapped on the 3,676-metre mountain at the Ranu Kumbolo observation station. The group included 137 climbers, 15 carriers, seven guides and six tourism officials, according to an spokesperson with the protected area.

“They remain secure at Ranu Kumbolo monitoring post,” an official said in a video statement. He said 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 seen moving to the south-southeast. Bad weather and precipitation forced the team to remain overnight there, he added.

The volcano, also called Mahameru, has burst many occasions in the past 200 years. However, as is the situation with many of the 129 live volcanoes in the archipelago, tens of thousands of residents continue to live on its productive highlands.

The mountain's last major eruption was in late 2021, when 51 people were lost their lives and several hundred others were burned and settlements were submerged in thick mud. The event forced the evacuation of more than 10,000 residents from their houses.

The country, an island chain of more than 280 million inhabitants, sits along the Pacific seismic belt, a horseshoe-shaped series of fault lines, and is susceptible to seismic events and volcanism.