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which monitors worldwide volcanic activity.

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Recent Volcano Observatory Activity Reports

Recent Updates from the U.S. Geological Survey Volcano Hazards Program

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AVO Cleveland YELLOW/ADVISORY - Unrest continues; elevated temperatures and steaming seen in satellite images
Sep 20, 2019 22:29 - Satellite observations during brief periods of clear weather over the last week showed the typical elevated surface temperatures in the summit crater and minor steam emissions. No ash emissions were observed. Seismicity was quiet occasional local earthquakes. There was nothing significant noted in local or regional infrasound data during the week. Additional episodes of lava effusion and explosions are likely and will occur without advance warning. The most recent explosion of Cleveland occurred on January 9, 2019. These explosions are normally short duration and only ...

AVO Semisopochnoi YELLOW/ADVISORY - Unrest continues; satellite data obscured by clouds. Seismicity is low.
Sep 20, 2019 22:29 - Unrest continues at Semisopochnoi volcano with low-level eruptive activity possible. Seismic activity has generally decreased over the past few weeks and AVO lowered the color code/activity level to YELLOW/ADVISORY on Wednesday September 18, 2019. Satellite observations were mostly obscured by clouds over the past week and no activity was observed. Semisopochnoi is monitored with an on-island seismic network and remotely by satellite and lightning sensors. Furthermore, an infrasound array on Adak Island may detect explosive emissions from Semisopochnoi with a 13 ...

AVO Shishaldin ORANGE/WATCH - Low-level eruption continues with tremor and elevated surface temperatures during week
Sep 20, 2019 22:29 - Low-level eruptive activity within the summit crater continues at Shishaldin. Seismicity remained elevated during the past week and was characterized by low-level tremor. Satellite data have shown elevated surface temperatures at the summit crater when views were not obscured by clouds. Conditions at the volcano appear to have changed little over the past several weeks, with slight growth in the scoria cone and lava flows within the summit crater. The low-level lava fountaining and repetitive minor explosive activity within the summit crater observed on August 17, 2019 is ...

CVO Cascade Range GREEN/NORMAL - All volcanoes are at normal levels.
Sep 20, 2019 16:56 - 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: A few small earthquakes were recorded at Mount Rainier, Mount St. Helens and Newberry Volcano over the past week. All monitoring systems show that activity at these and the rest of the Cascade Range volcanoes remained at background ...

HVO Mauna Loa YELLOW/ADVISORY - Mauna Loa is not erupting. Seismicity above background; continued summit inflation.
Sep 19, 2019 20:08 - Activity Summary: Mauna Loa Volcano is not erupting. Rates of deformation and seismicity have not changed significantly in the past week and persist above long-term background levels. Observations: During the past week, approximately 90 small-magnitude earthquakes (all smaller than M2.5) were detected beneath the upper elevations of Mauna Loa. Most of the earthquakes occurred at shallow to intermediate depths of less than 10 km (~6 miles) below ground level. Global Positioning System (GPS) and Interferometric Synthetic Aperture Radar (InSAR) measurements show ...

AVO Makushin GREEN/NORMAL - Existing digital equipment refurbished with more robust digital installations
Sep 6, 2019 18:29 - ---

AVO Korovin GREEN/NORMAL - Network upgraded from analog to digital
Sep 6, 2019 18:29 - ---

AVO Katmai GREEN/NORMAL - Three stations upgraded from analog to digital
Sep 6, 2019 18:29 - ---

AVO Kanaga GREEN/NORMAL - Network upgraded from analog to digital
Sep 6, 2019 18:29 - ---

AVO Iliamna GREEN/NORMAL - Existing digital equipment refurbished with more robust digital installations
Sep 6, 2019 18:29 - ---

AVO Great Sitkin GREEN/NORMAL - Network upgraded from analog to digital
Sep 6, 2019 18:29 - ---

AVO Gareloi GREEN/NORMAL - Network upgraded from analog to digital
Sep 6, 2019 18:29 - ---

AVO Dutton GREEN/NORMAL - Network upgraded from analog to digital
Sep 6, 2019 18:29 - ---

AVO Augustine GREEN/NORMAL - Three stations upgraded from analog to digital
Sep 6, 2019 18:29 - ---

AVO Akutan GREEN/NORMAL - Existing digital equipment refurbished with more robust digital installation
Sep 6, 2019 18:29 - ---

AVO Okmok GREEN/NORMAL - Existing digital equipment refurbished with more robust digital installations
Sep 6, 2019 18:29 - ---

AVO Tanaga GREEN/NORMAL - Network upgraded from analog to digital
Sep 6, 2019 18:29 - ---

AVO Westdahl GREEN/NORMAL - One station upgraded from analog to digital
Sep 6, 2019 18:29 - ---

AVO Wrangell GREEN/NORMAL - The seismic network on Mount Wrangell volcano has been reestablished.
Sep 6, 2019 18:28 - The Alaska Volcano Observatory (AVO) has reestablished seismic monitoring instruments at Mount Wrangell and can now confidently monitor seismic unrest at the volcano. With renewed seismic monitoring, the volcano moves from "UNASSIGNED" to Volcano Alert Level NORMAL and Aviation Color Code GREEN. As at other Alaska volcanoes, AVO will continue to use satellite, infrasound, and lightning data, and reports from pilots and ground observers to detect signs of eruptive activity.

HVO Kilauea GREEN/NORMAL - Low activity: no lava; slow inflation of summit + middle ERZ; water pond in summit crater
Sep 5, 2019 23:35 - Activity Summary: KÄ«lauea Volcano is not erupting. Monitoring data continue to show steady rates of seismicity and ground deformation, low rates of sulfur dioxide emission, and only minor geologic changes since the end of eruptive activity in September 2018. Water continues to pond at the bottom of Halema"uma"u inside the summit caldera. Observations: Monitoring data have shown no significant changes in volcanic activity over the past week. Rates of earthquake activity or seismicity across the volcano remain largely steady. Sulfur dioxide emission rates are low ...