Mount Mahameru Eruption in Indonesia Prompts Emergency Relocations

The nation's Mount Semeru, the highest peak on Java island, has exploded, covering several villages with falling ash, prompting evacuations and causing officials to elevate the warning to the highest level.

The mountain 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 multiple times from noon to evening, while a dense plume of fiery clouds rose 2km into the sky, as stated by the nation's geological authority.

The eruptions that unfolded throughout the day forced officials to raise the volcano’s alert level on two occasions, from the third-highest level to the top level, the authority reported. No deaths or injuries have been reported.

More than 300 residents in the three villages most endangered in the area of Lumajang were relocated to government shelters, as mentioned by a representative for the national disaster mitigation agency.

He stated that increased activity of the volcano on the afternoon of Wednesday led authorities to expand the hazard area to 8km from the crater. People were advised to stay clear from an zone along the Besuk Kobokan River, which is the path of the molten rock stream, as searing gas moved down Semeru’s slopes.

Videos on online platforms showed a dense cloud of ash sweeping through a forested valley to a waterway beneath a bridge. Locals, some with faces smeared with ash and water, escaped to temporary shelters or departed for other safe areas.

Local media reported that authorities were struggling to save about 178 people trapped on the 3,676-metre peak at the Ranu Kumbolo monitoring post. The party included 137 hikers, 15 carriers, seven escorts and six travel representatives, according to an official with the national park.

“They are currently safe at Ranu Kumbolo monitoring post,” a spokesperson stated in a recorded message. He noted the post was situated 4.5km from the crater on the north side of the volcano, which is outside the trajectory of the fiery cloud movement that was seen traveling to the south-southeast. Bad weather and precipitation forced the team to remain overnight there, he added.

The volcano, also known as Great Mountain, has erupted many occasions in the last two centuries. However, as is the case with many of the 129 active volcanoes in the archipelago, thousands of residents still to live on its fertile slopes.

The mountain's previous significant explosion was in December 2021, when 51 people were lost their lives and several hundred more were burned and villages were buried in thick mud. The eruption led to the evacuation of more than 10,000 people from their homes.

The country, an island chain of over 280 million inhabitants, is located along the Pacific “ring of fire”, a horseshoe-shaped series of fault lines, and is prone to seismic events and volcanic activity.

Hannah Ponce
Hannah Ponce

Wildlife biologist specializing in tropical ecosystems, with a passion for sloth research and environmental advocacy.

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