• Emission of steam and gas at Momotombo volcano, Nicaragua

    After further investigation, the plume seen in satellite and webcam looks more like water vapor and gases, the Washington VAAC reported at 16:14 UTC on October 18, 2019, shortly after receiving information about possible volcanic ash plume rising above Momotombo…

  • Shishaldin volcano alert levels raised, Alaska

    The Alaska Volcano Observatory (AVO) raised the Aviation Color Code for Shishaldin volcano to ORANGE and the Alert Level to WATCH on October 17, 2019. Satellite observations indicated that a lava effusion event began on October 13 and is likely continuing. The…

  • Masaya volcano expels ashes, Nicaragua

    Nicaraguan Masaya volcano expelled small amounts of ash toward the municipality of Ticuantepe on October 15, 2019. Early morning winds blew away most of the accumulated ashes. Winds continue to blow from southeast to northwest, so an investigation and monitoring of…

  • Submarine eruption at Lateiki (Metis Shoal), Tonga

    The Aviation Color Code for Lateiki volcano, previously known as Matis Shoal, was raised to Orange at 21:20 UTC on October 14, 2019, after several observations confirmed eruption in progress. Real Tonga pilots flying between Tongatapu and Vava'u observed the…

  • Stormquakes – scientists discover new geophysical phenomenon

    A study published on October 14, 2019, shows a new geophysical phenomenon where a heavy storm can trigger seismic events in the nearby ocean as powerful as a 3.5 magnitude earthquake. Lead author Wenyuan Fan, an assistant professor of Earth, Ocean and Atmospheric…

  • The Weekly Volcanic Activity Report: October 9 – 15, 2019

    New activity/unrest was reported for 1 volcano from October 9 to 15, 2019. During the same period, ongoing activity was reported for 13 volcanoes. New activity/unrest: Lateiki, Tonga Islands Ongoing activity: Aira, Kyushu (Japan) | Ambrym, Vanuatu | Asosan, Kyushu…