Live Panorama of Kīlauea Caldera from HVO Observation Tower

  • AVO Great Sitkin YELLOW/ADVISORY - Seismicity elevated; small explosion mid-week; no ash cloud observed
    on January 1, 1970 at 12:00 am

    Dec 14, 2018 23:38 - Low-level unrest continues at Great Sitkin Volcano. Seismicity remains elevated with small earthquakes occurring at rates above background levels. A small explosion, detected in seismic data, occurred on Tuesday morning, December 11, at 6:05 AM AKST (15:05 UTC). The explosion was not recorded by the nearby infrasound array on Adak Island, and no eruption cloud was observed in satellite data. No other eruptive activity was detected over the past week. Great Sitkin Volcano is monitored with a local real-time seismic network, which will typically allow AVO to detect ... […]

  • AVO Cleveland ORANGE/WATCH - Two small explosions occurred this week; no ash clouds observed
    on January 1, 1970 at 12:00 am

    Dec 14, 2018 23:38 - Two small explosions occurred at Cleveland volcano during the past week. The first happened Saturday, December 8, at 11:55 PM AKST (08:55 UTC on Dec 9). The second, which had a higher peak seismic amplitude, occurred Wednesday, December 12, at 11:53 AM AKST (20:53 UTC). No ash cloud was observed after either event, though satellite views were largely obscured by clouds at the time. The color code and alert level were raised to Orange/Watch after the second explosion. Elevated surface temperatures at the volcano's summit were also occasionally observed in satellite imagery ... […]

  • AVO Semisopochnoi YELLOW/ADVISORY - No eruptive activity observed; seismic network offline
    on January 1, 1970 at 12:00 am

    Dec 14, 2018 23:38 - No eruptive activity was observed in satellite imagery or regional infrasound data over the past week. The satellite link that transmits seismic data from Semisopochnoi failed on November 1, but an infrasound array on Adak Island should detect significant explosive emissions from Semisopochnoi (with a 13-minute delay) if atmospheric conditions permit. A return to eruptive activity remains a possibility at Semisopochnoi and it could occur with little or no warning. AVO will continue to monitor the volcano closely. Semisopochnoi is normally monitored with an ... […]

  • AVO Veniaminof ORANGE/WATCH - Eruption pauses; resumes Dec 13 with plume and elevated surface temperatures
    on January 1, 1970 at 12:00 am

    Dec 14, 2018 23:38 - Veniaminof's ongoing eruption paused, or at least declined dramatically, for several days starting late last week, but has since resumed. The character of the seismicity began to change on Thursday, December 6, and, over the following days, the continuous tremor recorded before then began to wax and wane and was replaced by low-frequency seismic events and weak tremor bursts. High-resolution satellite imagery acquired on Monday, December 10, suggested that the relatively long-lived discharge of a lava from the volcano's intracaldera cone had stopped, though weak explosive ... […]

  • CVO Cascade Range GREEN/NORMAL - All volcanoes are at normal levels.
    on January 1, 1970 at 12:00 am

    Dec 14, 2018 21:08 - Activity Update: All volcanoes in the Cascade Range of Oregon and Washington are at normal background levels of activity. These include Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, and Mount Adams in Washington State; and Mount Hood, Mount Jefferson, Three Sisters, Newberry, and Crater Lake in Oregon. Recent Observations: Monitoring systems show that activity at Cascade Range volcanoes remained at background levels throughout the week. Due to winter storms in the Cascades, wind noise dominates many of the seismograph records. […]