Volcano Semeru Outburst in Indonesia Triggers Evacuations

Indonesia's Mount Semeru, the highest peak on Java island, has exploded, blanketing several villages with falling ash, leading to evacuations and causing officials to elevate the warning to the highest level.

The volcano in East Java province released searing clouds of hot ash and a mixture of rock, lava and gas that moved up to 7km down its sides several times from midday to evening, while a thick column of hot clouds rose 2km into the air, as stated by Indonesia’s Geology Agency.

The outbursts that unfolded throughout the day forced authorities to increase the volcano’s alert level on two occasions, from the level three to the highest, the authority reported. No casualties have been reported.

More than 300 residents in the three villages most at risk in the district of Lumajang were relocated to government shelters, as mentioned by a spokesperson for the national emergency management body.

He stated that heightened volcanic movements of the mountain on the afternoon of Wednesday prompted authorities to expand the hazard area to 5 miles from the crater. People were advised to keep away from an area along the Kobokan River, which is the path of the lava flow, as searing gas moved down Semeru’s slopes.

Videos on online platforms displayed a thick plume of ash sweeping through a wooded ravine to a waterway beneath a overpass. Locals, some with faces covered with ash and water, fled to temporary shelters or departed for other safe areas.

Local media indicated that authorities were struggling to rescue about 178 people trapped on the 12,060-foot mountain at the Ranu Kumbolo observation station. The group comprised 137 climbers, 15 porters, seven escorts and six travel representatives, according to an spokesperson with the protected area.

“They remain secure at the Ranu Kumbolo station,” a spokesperson stated in a recorded message. He said the post was located 4.5km from the summit on the north side of the volcano, which is outside the trajectory of the fiery cloud movement that was observed moving to the south-southeast. Bad weather and rain required the group to remain overnight there, he explained.

Semeru, also known as Great Mountain, has erupted numerous times in the last two centuries. However, as is the situation with numerous of the 129 active volcanoes in Indonesia, thousands of people still to live on its fertile slopes.

Semeru’s last major eruption was in December 2021, when 51 individuals were killed and several hundred others were burned and villages were buried in layers of mud. The eruption forced the relocation 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 horseshoe-shaped series of tectonic boundaries, and is susceptible to earthquakes and volcanism.