Mount Mahameru Eruption in the Southeast Asian nation Prompts Evacuations

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

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

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

More than 300 inhabitants in the three villages most at risk in the district of Lumajang were relocated to official safe havens, as mentioned by a representative for the national emergency management body.

He stated that increased activity of the volcano on the afternoon of Wednesday led officials to expand the danger zone to 8km from the summit. Residents were urged to stay clear from an area along the Kobokan River, which is the route of the molten rock stream, as scorching gases moved down Semeru’s slopes.

Videos on social media showed a dense cloud of ash sweeping through a wooded ravine to a river beneath a overpass. Locals, some with faces smeared with ash and water, fled to temporary shelters or departed for other safe areas.

Regional news outlets indicated that authorities were struggling to save about 178 people trapped on the 3,676-metre mountain at the Ranu Kumbolo monitoring post. The group comprised 137 climbers, 15 carriers, 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 video statement. He noted the post was situated 4.5km from the summit on the north side of the volcano, which is outside the trajectory of the hot cloud flow that was seen traveling to the southeast direction. Inclement conditions and rain forced the group to spend the night there, he explained.

Semeru, also known as Mahameru, has erupted many occasions in the last two centuries. Still, as is the case with many of the 129 live volcanoes in the archipelago, thousands of residents still to live on its productive highlands.

Semeru’s last major eruption was in December 2021, when 51 people were killed and several hundred others were injured and settlements were submerged in thick mud. The event forced the evacuation of over ten thousand residents from their houses.

Indonesia, an archipelago of more than 280 million people, is located along the Pacific seismic belt, a curved series of fault lines, and is prone to seismic events and volcanic activity.

Kim Ramirez
Kim Ramirez

A passionate golfer and journalist with over a decade of experience covering PGA tours and equipment innovations.