Volcano Semeru Eruption in Indonesia Prompts Evacuations

Indonesia's Semeru volcano, the tallest summit on Java island, has exploded, blanketing multiple communities with volcanic ash, prompting evacuations and leading authorities to raise the alert to the highest level.

The volcano in East Java province unleashed blistering plumes of hot ash and a mixture of rock, lava and gas that travelled up to 7km down its sides several times from midday to evening, while a thick column of hot clouds rose 2km into the sky, according to the nation's geological authority.

The outbursts that unfolded throughout the day forced authorities to increase the mountain's warning status twice, from the level three to the highest, the agency said. No casualties have been reported.

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

He stated that heightened volcanic movements of the mountain on Wednesday afternoon led authorities to expand the hazard area to 5 miles from the summit. People were advised to keep away from an zone 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. Residents, some with faces covered with volcanic dust and water, fled to makeshift refuges or departed for other safe areas.

Local media reported that authorities were struggling to save about 178 people trapped on the 12,060-foot mountain at the Ranu Kumbolo observation station. The party included 137 climbers, 15 porters, seven guides and six travel representatives, according to an spokesperson with the national park.

“They are currently safe at the Ranu Kumbolo station,” an official stated in a recorded message. He noted the station was located 2.8 miles from the summit on the northern slope of the mountain, which is outside the trajectory of the fiery cloud movement that was observed traveling to the south-southeast. Inclement conditions and precipitation forced the team to remain overnight there, he explained.

The volcano, also known as Mahameru, has burst numerous times in the past 200 years. However, as is the case with numerous of the 129 active volcanoes in the archipelago, tens of thousands of residents continue to reside on its fertile slopes.

Semeru’s previous significant explosion was in late 2021, when 51 individuals were lost their lives and hundreds more were burned and villages were submerged in thick mud. The event led to the evacuation of more than 10,000 residents from their homes.

Indonesia, an archipelago of over 280 million people, is located along the Pacific seismic belt, a horseshoe-shaped series of tectonic boundaries, and is prone to seismic events and volcanic activity.