Volcano Semeru Eruption in Indonesia Triggers Evacuations

The nation's Semeru volcano, the tallest summit on Java island, has exploded, blanketing multiple communities with falling ash, prompting evacuations and causing officials to elevate the alert to the highest 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 moved up to 4 miles down its sides multiple times from midday to dusk, while a thick column of hot clouds rose 1.2 miles into the sky, as stated by the nation's geological authority.

The outbursts that occurred throughout the day compelled officials to raise the volcano’s alert level on two occasions, from the third-highest level to the top level, the authority reported. No casualties have been announced.

More than 300 residents in the three villages most at risk in the district of Lumajang region were relocated to government shelters, as mentioned by a representative for the national emergency management body.

He stated that increased activity of the mountain on the afternoon of Wednesday led authorities to expand the danger zone to 5 miles from the summit. Residents were advised to keep away from an area along the Besuk Kobokan River, which is the route of the lava flow, as searing gas flowed down Semeru’s slopes.

Videos on online platforms showed a dense cloud of volcanic dust sweeping through a forested valley to a waterway beneath a overpass. Locals, some with faces covered with ash and rain, fled to makeshift refuges or departed for other safe areas.

Regional news outlets indicated that authorities were struggling to rescue about 178 people stranded on the 3,676-metre peak at the Ranu Kumbolo monitoring post. The party included 137 hikers, 15 porters, seven escorts and six tourism officials, according to an official with the protected area.

“They remain secure at the Ranu Kumbolo station,” a spokesperson said in a recorded message. He said the station was located 2.8 miles from the crater on the north side of the mountain, which is outside the trajectory of the hot cloud flow that was seen traveling to the south-southeast. Inclement conditions and rain forced the group to spend the night there, he explained.

Semeru, also known as Great Mountain, has erupted numerous times in the past 200 years. However, as is the case with many of the 129 active volcanoes in Indonesia, thousands of people continue to reside on its productive highlands.

Semeru’s last major eruption was in late 2021, when 51 people were lost their lives and several hundred more were injured and settlements were buried in layers of mud. The event led to the evacuation of more than 10,000 people from their homes.

The country, an archipelago of over 280 million people, is located along the Pacific seismic belt, a curved series of fault lines, and is prone to earthquakes and volcanism.