An explosive eruption occurred at Semeru volcano in East Java, Indonesia, at 08:49 LT (01:49 UTC) on March 29, 2026, producing an ash plume rising 800 m (2 625 feet) above the summit and a pyroclastic density current traveling 3.5 km (2.2 miles) toward the Besuk Kobokan drainage.
Multiple eruptions at Mount Semeru in East Java, Indonesia, on February 13 and 14, 2026, produced pyroclastic flows up to 6 km (3.7 miles) down the volcano’s southeastern flank and ash plumes up to 2 000 m (6 500 feet) above the crater. PVMBG maintains a 13 km (8 miles) exclusion zone in the southeastern sector.
A large lahar triggered by heavy rains on Mount Semeru trapped a man in the Regoyo River in East Java, on Sunday, December 21, 2025.
A major eruption at Mount Semeru, East Java, Indonesia, on November 19, 2025, produced large pyroclastic flows descending the southern slopes. One of them was captured on video, allowing both the sight and sound of the approaching flow to be recorded. The video shows a large pyroclastic density current moving downslope at high speed, generating…
Indonesia’s Geological Agency raised the alert level for Semeru volcano to the highest (Level IV) following a major eruption on November 19, 2025, that produced an ash column up to 17.9 km (59 000 feet) above sea level. Authorities ordered evacuations of at least 300 residents from nearby villages and expanded exclusion zones up to 8 km (5 miles) from the crater and along the Besuk Kobokan valley. No casualties have been reported so far.
A major eruption took place at Semeru volcano, Indonesia, on November 19, 2025, producing large pyroclastic flow and ash column up to 16.5 km (54,000 feet) above sea level. The Aviation Color Code was raised to Red while authorities issued exclusion zones along Besuk Kobokan.
A secondary lahar flow originating from remobilized pyroclastic and tephra deposits on the southern flank of Mount Semeru, Indonesia, occurred on October 21, 2025, trapping a truck near Gladak Perak Bridge in Lumajang Regency, East Java. The rain-induced lahar, classified as a cold, non-eruptive sediment-water flow, moved through the Besuk Kobokan drainage, carrying a dense slurry of volcanic debris and runoff.
10 days of continuous rainfall caused a large amount of volcanic material, debris and water to move down the slopes of the Semeru volcano on July 7, 2023, leading to destructive overflows and severe damage.
A high-level eruption occurred at Indonesia’s Semeru volcano on December 4, 2022, prompting authorities to raise the Alert Level from III to IV. The last major eruption at this volcano took place on December 4, 2021, leaving 51 people dead and several hundred others injured.
At least 39 people have been killed, 12 are missing and 57 others have been injured after powerful eruption of Semeru volcano in the Indonesian province of East Java on Saturday, December 4, 2021. Nearly 3 000 houses and 38 schools were damaged. Saturday's…
