• Planchón-Peteroa volcano enters new eruptive phase, Chile–Argentina border

    ByTeo Blašković

    A period of renewed eruptive activity occurred at Planchón-Peteroa volcanic complex on the Chile–Argentina border between late October and early November 2025. Volcanic Ash Advisory Center (VAAC) Buenos Aires issued multiple warnings for continuous ash emissions reaching altitudes of up to 4 600 m (15 000 feet). Local monitoring networks reported persistent degassing and minor explosions. The volcanic alert level remains at Yellow.

  • Fine ash emissions and increased tremor at Planchón-Peteroa, Chile–Argentina

    ByTeo Blašković

    The Argentine Geological and Mining Service (SEGEMAR) reported increased surface activity at the Planchón-Peteroa volcanic complex starting at 01:00 LT (04:00 UTC) on October 3, 2025, including emissions of fine volcanic ash rising up to 250 m (820 feet) above the crater. The technical alert remains at Yellow, with continued binational monitoring by SEGEMAR and Chile’s National Geology and Mining Service (SERNAGEOMIN).

  • Abnormal seismicity under Lanin volcano, alert level raised

    ByTW

    An energetic seismic swarm has been detected under Lanin volcano on the border of Chile and Argentina, prompting the Chilean National Geological and Mining Service (Sernageomin) to raise the volcanic alert level to Yellow. The last known eruption of this volcano…