Mount Mahameru Eruption in the Southeast Asian nation Triggers Evacuations

The nation's Semeru volcano, the tallest summit on the island of Java, has exploded, covering several villages with volcanic ash, prompting evacuations and leading authorities to raise the warning to the highest level.

The mountain in East Java province unleashed blistering plumes of fiery ash and a combination of stone, molten rock, and gases that travelled up to 7km down its sides multiple times from noon to dusk, while a dense plume of hot clouds rose 2km into the sky, according to Indonesia’s Geology Agency.

The eruptions that occurred throughout the day forced officials to increase the volcano’s alert level on two occasions, from the third-highest level to the highest, the agency said. No casualties have been reported.

More than 300 inhabitants in the three communities most endangered in the district of Lumajang region were relocated to government shelters, as mentioned by a spokesperson for the national emergency management body.

He stated that heightened volcanic movements of the volcano on the afternoon of Wednesday prompted officials to widen the danger zone to 5 miles from the crater. Residents were advised to keep away from an area along the Besuk Kobokan River, which is the path of the lava flow, as scorching gases flowed down Semeru’s slopes.

Videos on online platforms displayed a dense cloud of volcanic dust sweeping through a forested valley to a waterway beneath a bridge. Locals, some with faces smeared with ash and rain, fled to makeshift refuges or departed for alternative secure locations.

Regional news outlets reported that authorities were struggling to save about 178 people trapped on the 3,676-metre peak at the Ranu Kumbolo observation station. The party included 137 hikers, 15 carriers, seven guides and six travel representatives, according to an spokesperson with the national park.

“They are currently safe at Ranu Kumbolo monitoring post,” an official said in a video statement. He noted the station was situated 2.8 miles from the summit on the north side of the mountain, which is not in the path of the hot cloud flow that was observed traveling to the south-southeast. Bad weather and rain forced the team to remain overnight there, he explained.

Semeru, also known as Mahameru, has burst numerous times in the last two centuries. However, as is the situation with many of the 129 live volcanoes in Indonesia, tens of thousands of people continue to reside on its fertile slopes.

The mountain's last major eruption was in late 2021, when 51 people were lost their lives and several hundred others were injured and villages were buried in thick mud. The eruption forced the relocation of more than 10,000 people from their homes.

Indonesia, an archipelago of more than 280 million inhabitants, is located along the Pacific seismic belt, a curved series of tectonic boundaries, and is susceptible to earthquakes and volcanic activity.