Mount Semeru Eruption in Indonesia Prompts Evacuations

Indonesia's Semeru volcano, the highest peak on Java island, has exploded, covering multiple communities with volcanic ash, leading to evacuations and causing officials to elevate the alert to the maximum level.

The volcano in the province of East Java unleashed blistering plumes of hot ash and a mixture of stone, molten rock, and gases that travelled up to 7km down its slopes several 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 raise the volcano’s alert level on two occasions, from the level three to the highest, the authority reported. No deaths or injuries have been reported.

Over three hundred inhabitants in the three communities most endangered in the area of Lumajang were relocated to official safe havens, according to a spokesperson for the national emergency management body.

He said that increased activity of the mountain on the afternoon of Wednesday prompted officials to expand the hazard area to 5 miles from the crater. Residents were urged to keep away from an zone along the Kobokan River, which is the path of the molten rock stream, as scorching gases flowed down Semeru’s slopes.

Footage on online platforms showed a dense cloud of volcanic dust moving through a wooded ravine to a river beneath a bridge. Residents, some with faces covered with volcanic dust and water, escaped to temporary shelters or left for alternative secure locations.

Regional news outlets reported that authorities were facing challenges to rescue about 178 people stranded on the 3,676-metre peak at the Ranu Kumbolo monitoring post. The group comprised 137 hikers, 15 porters, seven guides and six travel representatives, according to an official with the protected area.

“They are currently safe at the Ranu Kumbolo station,” an official stated in a video statement. He said the post was located 2.8 miles from the summit on the northern slope of the mountain, which is not in the path of the fiery cloud movement that was seen moving to the south-southeast. Inclement conditions and rain required the group to spend the night there, he explained.

Semeru, also called Great Mountain, has burst 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 reside on its productive highlands.

Semeru’s last major eruption was in December 2021, when 51 individuals were lost their lives and hundreds more were burned and villages were submerged in thick mud. The event led to the evacuation of more than 10,000 residents from their homes.

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