Volcano Mahameru Eruption in the Southeast Asian nation Triggers Evacuations

Indonesia's Mount Semeru, the tallest summit on the island of Java, has erupted, covering several villages with falling ash, leading to 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 moved up to 7km down its slopes multiple times from noon to dusk, while a thick column of fiery clouds rose 2km 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 twice, from the third-highest level to the top level, the authority said. No deaths or injuries have been reported.

Over three hundred inhabitants in the three villages most at risk in the district of Lumajang region were evacuated to official safe havens, as mentioned by a representative for the national disaster mitigation agency.

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

Videos on online platforms displayed a dense cloud of ash sweeping through a wooded ravine to a river beneath a bridge. Residents, some with faces covered with ash and water, escaped to temporary shelters or departed for other safe areas.

Local media indicated that emergency teams were facing challenges to rescue about 178 people stranded on the 3,676-metre mountain at the Ranu Kumbolo observation station. The group comprised 137 hikers, 15 porters, seven escorts and six tourism officials, according to an official with the protected area.

“They are currently safe at Ranu Kumbolo monitoring post,” an official stated in a video statement. He said the post was situated 4.5km from the crater on the north side of the mountain, which is not in the path of the fiery cloud movement that was seen traveling to the southeast direction. Inclement conditions and precipitation required the team to remain overnight there, he explained.

Semeru, also known as Great Mountain, has erupted many occasions in the last two centuries. However, as is the situation with many of the 129 live volcanoes in the archipelago, thousands of people continue to live on its productive highlands.

Semeru’s last major eruption was in December 2021, when 51 people were lost their lives and several hundred others were burned and villages were submerged in layers of mud. The event led to the relocation of over ten thousand residents from their houses.

Indonesia, an island chain of over 280 million people, sits along the Pacific seismic belt, a curved series of tectonic boundaries, and is prone to earthquakes and volcanic activity.