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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 Great Sitkin YELLOW/ADVISORY - Small earthquakes continue; satellite and webcam views cloudy
Mar 29, 2020 20:16 - Small local earthquakes continued to occur at Great Sitkin over the past day. Satellite and webcam views were obscured by clouds. Great Sitkin volcano is monitored with a local real-time seismic network, which will typically allows AVO to detect changes in unrest that may lead to an explosive eruption. Rapid detection of an ash-producing eruption would be accomplished using a combination of seismic, infrasound, lightning, and satellite data.

AVO Cleveland YELLOW/ADVISORY - No significant seismic activity; summit gas plume
Mar 29, 2020 20:16 - No significant seismicity was recorded at Cleveland volcano. A weak summit gas plume was visible in webcam views yesterday, indicating continued unrest. Episodes of lava effusion and explosions can occur without advance warning. Explosions from Cleveland are normally short duration and only present a hazard to aviation in the immediate vicinity of the volcano. Larger explosions that present a more widespread hazard to aviation are possible, but are less likely and occur less frequently. Cleveland volcano is monitored by only two seismic stations, which restricts ...

AVO Semisopochnoi ORANGE/WATCH - Elevated seismicity; satellite views cloudy
Mar 29, 2020 20:16 - Seismicity remains elevated at Semisopochnoi. No activity was seen in satellite views, which were cloudy over the past day. Semisopochnoi is monitored by local seismic sensors, satellite data, and lightning detection networks. An infrasound array on Adak Island may detect explosive emissions from Semisopochnoi with a slight delay (approximately 13 minutes) if atmospheric conditions permit.

AVO Shishaldin ORANGE/WATCH - Elevated seismicity; satellite and webcam views cloudy
Mar 29, 2020 20:16 - Unrest continues at Shishaldin. Seismicity remains elevated with continuous low-level tremor. Webcam and satellite views were obscured by clouds over the past day. Eruptive activity appears confined to the summit area during this most recent period of unrest, which started mid-March. Activity could increase with little or no warning, however, resulting in lava flows outside of the crater, lahars, and ash emissions. Shishaldin is monitored by local seismic and infrasound sensors, satellite data, web cameras, a telemetered geodetic network, and distant infrasound and ...

CVO Cascade Range GREEN/NORMAL - All volcanoes are at normal levels.
Mar 27, 2020 17:40 - 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: Over the past week small earthquakes were located at Mount Rainier, Mount St. Helens, and Newberry volcanoes. All earthquakes were consistent with the normal range of seismic activity at these volcanoes.

HVO Mauna Loa YELLOW/ADVISORY - Mauna Loa is not erupting. Seismicity above background, summit inflation continues.
Mar 26, 2020 20:27 - Activity Summary: Mauna Loa Volcano is not erupting. Rates of deformation and seismicity have not changed significantly over the past week and remain above long-term background levels. Observations: During the past week, HVO seismometers recorded around 42 small-magnitude earthquakes beneath the volcano's upper elevations. Most of these events occurred at shallow depths of less than 5 kilometers (~3 miles) below ground level. There were no events on Mauna Loa above magnitude 2.0. Global Positioning System (GPS) measurements show continued slow summit inflation, ...

CALVO GREEN/NORMAL - CA volcanoes at normal background levels of seismicity and deformation during past week.
Mar 24, 2020 16:00 - Monitored CALIFORNIA VOLCANOES Current Volcano Alert Level: all NORMAL Current Aviation Color Code: all GREEN Activity Update: All volcanoes monitored by CalVO using telemetered, real-time sensor networks exhibit normal levels of background seismicity and deformation. Volcanoes monitored include Mount Shasta, Medicine Lake Volcano, Clear Lake Volcanic Field, Lassen Volcanic Center, Long Valley Volcanic Region, Coso Volcanic Field, Ubehebe Craters, and Salton Buttes. Observations for March 16, 2020 (0000h PDT) through March 22, 2020 (2359h PDT): Clear Lake ...

HVO Kilauea GREEN/NORMAL - No eruptive activity. Slow inflation of summit, rift zone. Rising water pond in summit crater
Mar 5, 2020 02:47 - Activity Summary: Kīlauea Volcano is not erupting. Monitoring data for the month of February show variable but typical rates of seismicity and ground deformation, low rates of sulfur dioxide emissions, and only minor geologic changes since the end of eruptive activity in September 2018. Observations: Monitoring data have shown no significant changes in volcanic activity in February. Rates of seismicity over the month were variable but within a range observed over the past year. Sulfur dioxide emission rates are low at the summit and are below detection limits at ...

HVO Loihi Seamount UNASSIGNED/UNASSIGNED - No activity of concern for Lō"ihi.
Mar 5, 2020 02:47 - Lō"ihi's earthquake activity in the vicinity of the volcano increased during the last month, however, the rate is within the range observed over the past decade.

HVO Hualalai GREEN/NORMAL - No activity of concern for Hualālai.
Mar 5, 2020 02:47 - No significant activity was recorded at Hualālai Volcano over the past month. Several small earthquakes were recorded in the vicinity of the volcano. HVO's continuously recording Global Positioning System (GPS) receiver atop Hualālai recorded no significant deformation over the past month.

HVO Haleakala GREEN/NORMAL - No activity of concern for Haleakalā.
Mar 5, 2020 02:47 - No significant activity was recorded at Haleakalā Volcano over the past month. One small earthquake was recorded in the immediate vicinity of the volcano. The continuously recording Global Positioning System (GPS) instrument atop Haleakalā (MAUI) recorded no significant deformation during this time.

HVO Mauna Kea GREEN/NORMAL - No activity of concern for Mauna Kea.
Mar 5, 2020 02:47 - No significant activity was detected at Mauna Kea Volcano over the past month. Rates of small earthquake activity detected below the volcano remain the same. The single, continuously recording Global Positioning System (GPS) receiver atop Mauna Kea (operated by NASA's Jet Propulsion Laboratory) recorded no significant changes in deformation during the month of January.

AVO Pavlof GREEN/NORMAL - Alert level lowered to GREEN/NORMAL based on decreased seismic activity.
Mar 3, 2020 19:38 - Over the past several weeks seismic activity has decreased at Pavlof. No eruptive activity or emissions from the summit have been observed since minor steam emissions in late February. Since activity is now at background levels, we are decreasing the Aviation Color Code and Alert Level to GREEN/NORMAL.

YVO Yellowstone GREEN/NORMAL - YVO Monthly Update: background seismicity and deformation
Mar 2, 2020 19:33 - Recent work and news Happy Birthday to Yellowstone National Park! On March 1, 1872, President Grant established the Park when he signed the Yellowstone Protection Act into law. Steamboat geyser, in Norris Geyser Basin, experienced four water eruptions in the past month, on February 1, 12, 21, and 28, bringing the total number of eruptions for the year to 6. Seismicity During February 2020, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, located 222 earthquakes in the Yellowstone ...

AVO Westdahl UNASSIGNED/UNASSIGNED - Alert levels changed to UNASSIGNED due to lack of seismic data
Feb 26, 2020 21:00 - Over the past several weeks the real-time seismic data stream at Westdahl volcano has ceased due to equipment problems in the field. Repairs are not feasible during the winter months. Without seismic data AVO cannot verify that the volcano is at its normal background state. Thus, the Aviation Color Code and Volcano Alert Levels are now UNASSIGNED. Planned field work in April and during the summer will reestablish and improve the seismic monitoring network. At this time, rapid detection of an eruption (if one were to occur) may be possible using a combination of ...