• Evacuations ordered after powerful eruption at Semeru volcano sends ash to 17.9 km (59 000 feet), Indonesia

    ByTeo Blašković

    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.

  • Partial collapse at Mount Merapi sends lava down slopes, Indonesia

    ByTeo Blašković

    A partial collapse occurred at Mount Merapi volcano, Central Java Province, Indonesia, on November 10, 2025, producing lava flows on its slopes. The event follows continuous volcanic activity observed in recent days, including a pyroclastic flow that traveled about 1 500 m (4 921 feet) southwest at 15:19 LT (08:19 UTC) on November 9, lasting 188.32 seconds. The volcano remains at Alert Level III (Siaga), and residents are advised to follow official safety recommendations.

  • Lahar from Mount Semeru traps truck near Gladak Perak, Lumajang, Indonesia

    ByTeo Blašković

    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.

  • Indonesian authorities warn of increased activity at Mount Anak Krakatau

    ByTW

    Seismic activity at Mount Anak Krakatau intensified on October 28, 2023, prompting Indonesian authorities to issue a 5 km (3.1 miles) exclusion zone around the main crater. The heightened activity included a range of earthquakes and internal vibrations indicative of potential eruptions.

  • Raung volcano Alert Level raised to 2, Indonesia

    ByTeo Blašković

    The Alert Level for Raung volcano was raised from 1 to 2 on July 29, 2022. The decision was based on the results of seismic monitoring and unstable conditions at the crater. The last eruption of this volcano took place in 2021 (VEI 2).

  • Sudden eruption at Krakatau volcano, Indonesia

    ByTW

    A sudden eruption took place at the Indonesian Krakatau volcano at around 07:13 UTC on October 26, 2021. The Aviation Color Code was raised to Orange. According to Anak Krakatau Volcano Observatory, the eruption was recorded on a seismogram with a maximum amplitude…