USGS Volcano Alerts

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Recent Volcano Observatory Activity Reports

  • : YVO Yellowstone GREEN/NORMAL - YVO Monthly Update: background seismicity and deformation - Recent Volcano Observatory Activity Reports
    Apr 1, 2021 18:21 - Recent work and news In the past month there were three major water eruptions of Steamboat Geyser, on March 3, 18, and 27. This brings the total number of eruptions for the year to 7. During winter months, the interval between Steamboat eruptions is longer than during the summer, probably due to lower groundwater levels in the absence of runoff from snow melt. If the geyser follows the patterns established since 2018, we expect to see the time between eruptions decrease as summer approaches. Seismicity During March 2021, the University of Utah Seismograph ...
  • : HVO Hualalai GREEN/NORMAL - No activity of concern for Hualālai. - Recent Volcano Observatory Activity Reports
    Apr 1, 2021 20:47 - No significant activity was recorded at Hualālai Volcano during the past month. There were 3 small-magnitude earthquakes—all less than M2.0—detected in the vicinity of the volcano. This earthquake count is on par with previous months.
  • : AVO Gareloi UNASSIGNED/UNASSIGNED - Seismic network offline due to loss of power from snow cover - Recent Volcano Observatory Activity Reports
    Mar 31, 2021 18:21 - Low power likely due to snow cover has resulted in loss of operation and communication with all seismic stations on Gareloi. As a result, the Alaska Volcano Observatory can no longer locate earthquakes or detect seismic signals that could indicate unrest at Gareloi volcano, and the Aviation Color Code and the Volcano Alert Level are now designated as UNASSIGNED. Seismic stations may come back online this spring as snowpack decreases. Any eruptive activity may still be detected, although with some delay, with regional infrasound networks, detection of lightning, and ...
  • : HVO Loihi Seamount UNASSIGNED/UNASSIGNED - No activity of concern for Lō‘ihi. - Recent Volcano Observatory Activity Reports
    Apr 1, 2021 20:47 - No significant activity was recorded at Lō‘ihi Volcano during the past month. There were 2 small-magnitude earthquakes—both less than M2.0—detected in the vicinity of the volcano.
  • : HVO Haleakala GREEN/NORMAL - No activity of concern for Haleakalā. - Recent Volcano Observatory Activity Reports
    Apr 1, 2021 20:47 - No significant activity was recorded at Haleakalā Volcano during the past month. There were no earthquakes detected in the vicinity of the volcano. The continuously recording Global Positioning System (GPS) receiver atop Haleakalā (MAUI) recorded no significant deformation.
  • : AVO Tanaga UNASSIGNED/UNASSIGNED - Partial loss of seismic network due to due to snow cover - Recent Volcano Observatory Activity Reports
    Mar 31, 2021 18:22 - Low power likely due to snow cover has resulted in loss of operation and communication with all but two seismic stations on Tanaga. As a result, the Alaska Volcano Observatory can no longer locate earthquakes that could indicate unrest at Tanaga, and the Aviation Color Code and the Volcano Alert Level are now designated as UNASSIGNED. Additional seismic stations may come back online this spring as snowpack decreases. Any eruptive activity or unrest may still be detected with the remaining seismic stations, in regional infrasound networks, through detection of ...
  • : HVO Mauna Kea GREEN/NORMAL - No activity of concern for Mauna Kea. - Recent Volcano Observatory Activity Reports
    Apr 1, 2021 20:47 - No significant activity was recorded at Mauna Kea Volcano during the past month. There were 18 small-magnitude earthquakes—all less than M2.0—detected in the vicinity of the volcano, most of which occurred more than 15 kilometers (approx. 9 miles) below ground level. The total earthquake count represents an increase of 100% from the previous month (double the number of events). The continuously recording Global Positioning System (GPS) receiver atop Mauna Kea (MKPM, operated by NASA’s Jet Propulsion Laboratory) recorded no significant deformation.
  • : AVO Shishaldin GREEN/NORMAL - Decrease in Alert Levels to UNASSIGNED/UNASSIGNED - Recent Volcano Observatory Activity Reports
    Apr 2, 2021 17:35 - Several seismic stations in the Shishaldin network are now operating after being offline for many months this winter. Data from these stations have improved the Alaska Volcano Observatory's monitoring capability, and allows for location of small local earthquakes, thus the Aviation Color Code is now GREEN and the Volcano Alert Level NORMAL. The Alaska Volcano Observatory continues to monitor Shishaldin with the local seismic, GPS, and tilt stations, web camera imagery, remote infrasound and lightning networks, and satellite images.
  • : CVO Cascade Range GREEN/NORMAL - All volcanoes are at normal levels. - Recent Volcano Observatory Activity Reports
    Apr 9, 2021 16:06 - 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 last week small earthquakes were located at Mount Rainier and Mount Hood, consistent with background levels of seismicity at each volcano.
  • : AVO Semisopochnoi ORANGE/WATCH - No significant activity detected in the last day. - Recent Volcano Observatory Activity Reports
    Apr 10, 2021 19:32 - No new explosions were detected in regional infrasound sensors and cloudy satellite images had no signs of significant volcanic emissions. Recent small ash plumes detected in satellite images did not have any associated infrasound detections, so it is possible low level activity has occurred undetected during cloudy conditions. Semisopochnoi is monitored by satellite data, regional infrasound, and lightning detection instruments. An infrasound array on Adak Island may detect explosive emissions from Semisopochnoi with a slight delay (approximately 13 minutes) if ...
  • : CALVO GREEN/NORMAL - CA volcanoes at normal background levels of seismicity and deformation during past week. - Recent Volcano Observatory Activity Reports
    Apr 6, 2021 14:35 - 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 29, 2021 (0000h PDT) through April 4, 2021 (2359h PDT) Clear Lake Volcanic ...
  • : AVO Cleveland YELLOW/ADVISORY - No unusual activity observed - Recent Volcano Observatory Activity Reports
    Apr 10, 2021 19:32 - No unusual activity observed in seismic, satellite and web camera data over the past day. 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's ability to precisely locate earthquakes and detect ...
  • : AVO Veniaminof ORANGE/WATCH - Seismic activity is low; no unusual eruptive activity detected - Recent Volcano Observatory Activity Reports
    Apr 10, 2021 19:32 - No unusual activity was observed in seismic, satellite and web-camera data over the past day. Eruptive activity at Veniaminof usually consists of minor ash emissions, lava fountaining and lava flows from the small cone in the summit caldera. Ash emissions are typically confined to the summit crater, but larger events can result in ash fall in nearby communities and drifting airborne ash. The partial restoration of local seismic data will help the Alaska Volcano Observatory to detect changes in unrest that may lead to a more significant explosive eruption. AVO ...
  • : HVO Mauna Loa YELLOW/ADVISORY - Mauna Loa is not erupting. Seismicity above background, summit inflation continues. - Recent Volcano Observatory Activity Reports
    Apr 8, 2021 20:01 - Activity Summary: Mauna Loa Volcano is not erupting. Rates of deformation and seismicity at the summit remain slightly elevated and above long-term background levels. Other Mauna Loa monitoring data streams show no significant change in deformation rates or patterns that would indicate increased volcanic hazard at this time. Observations: During the past week, HVO seismometers recorded approximately 134 small-magnitude earthquakes below Mauna Loa, most concentrated below the summit and upper-elevation flanks of the volcano. All of the earthquakes were less than M2.5 ...
  • : HVO Kilauea ORANGE/WATCH - West vent continues to erupt in Halemaʻumaʻu. SO2 emission rates remain elevated. - Recent Volcano Observatory Activity Reports
    Apr 10, 2021 18:56 - Activity Summary: Kīlauea Volcano is erupting. Lava activity is confined to Halemaʻumaʻu with lava erupting from a vent on the northwest side of the crater. This morning, April 10, the lava lake was 225 m (739 ft) deep and remains stagnant over its eastern half. SO2 emission rates remain elevated at 1000 t/day, last measured on April 8. Summit Observations: The most recent sulfur dioxide emission rate, measured on April 8, was 1000 t/day. This is elevated compared to rates in the months before the eruption started on December 20 (less than 100 t/day), but lower ...

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Updated: March 11, 2011 — 12:28 am

The Author

Rich Fleetwood

Rich is the founder of SurvivalRing, now in it's 24th year, author of multimedia CDs and DVDs, loves the outdoors, his family, his geeky skill-set, and lives in rural southern Wyoming, just below the continental divide (long story, that...). Always ready to help others, he shares what he learns on multiple blogs, many social sites, and more. With a background in preparedness and survival skills, training with county, state, and national organizations, and skills in all areas of media and on air experience in live radio and television, Rich is always thinking about the "big picture", when it comes to helping individuals and families prepare for life's little surprises.

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