USGS Volcano Alerts

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Recent Volcano Observatory Activity Reports

  • : CALVO GREEN/NORMAL - CA volcanoes at normal background levels of seismicity and deformation during past week. - Recent Volcano Observatory Activity Reports
    Nov 30, 2021 03:10 - 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 November 22, 2021 (0000h PST) through November 28, 2021 (2359h PST): Clear ...
  • : CVO Cascade Range GREEN/NORMAL - All volcanoes are at normal levels. - Recent Volcano Observatory Activity Reports
    Dec 3, 2021 18:04 - 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: Earthquakes were located at Mount Rainier, Mount St. Helens, Mount Hood, and Crater Lake this past week, consistent with background seismicity levels at each volcano.
  • : AVO Katmai GREEN/NORMAL - Resuspended ash was detected in the Katmai area this week. No eruption is in progress. - Recent Volcano Observatory Activity Reports
    Nov 26, 2021 20:42 - On Thursday November 25, strong winds in the vicinity of Katmai and the Valley of Ten Thousand Smokes picked up loose volcanic ash erupted during the 1912 Novarupta-Katmai eruption. The resulting resuspended ash cloud extended southeast over Shelikof Strait and Kodiak Island. This phenomenon is not the result of recent volcanic activity and occurs seasonally in the spring and fall during times of high winds and dry snow-free conditions in the Katmai area and other young volcanic areas of Alaska. All of the volcanoes of the Katmai area (Snowy, Griggs, Katmai, ...
  • : HVO Mauna Kea GREEN/NORMAL - No activity of concern for Mauna Kea. - Recent Volcano Observatory Activity Reports
    Dec 4, 2021 01:01 - No significant activity was recorded at Mauna Kea Volcano during the past month. There were 82 small-magnitude earthquakes—all less than M3.0—detected in the vicinity of the volcano. This earthquake count is on par with previous months. The continuously recording Global Positioning System (GPS) instrument atop Mauna Kea (MKPM, operated by NASA’s Jet Propulsion Laboratory) recorded no significant deformation.
  • : HVO Mauna Loa YELLOW/ADVISORY - Mauna Loa is not erupting. Seismicity remains near background. - Recent Volcano Observatory Activity Reports
    Dec 2, 2021 21:20 - Activity Summary: Mauna Loa Volcano is not erupting. Rates of seismicity remain slightly elevated above long-term background levels, but have not changed significantly over the past week. Other Mauna Loa monitoring data streams – ground deformation, gas concentrations, visual appearance - show no significant changes. Observations: During the past week, HVO seismometers recorded approximately 51 small-magnitude (below M2.5) earthquakes below the summit and upper-elevation flanks of Mauna Loa and one M3.3 earthquake on Mauna Loa's west flank on December 1, 2021. The ...
  • : YVO Yellowstone GREEN/NORMAL - YVO Monthly Update: background seismicity and deformation - Recent Volcano Observatory Activity Reports
    Dec 1, 2021 18:25 - Recent work and news During the usual seasonal closure of Yellowstone National Park (as part of the transition from summer to winter operations), Yellowstone Volcano Observatory scientists and collaborators conducted multidisciplinary research experiments in the Upper Geyser Basin, deploying numerous instruments in the region near Old Faithful. The work is part of an ongoing effort to better understand geyser plumbing systems, chemistries, and eruptive patterns. Steamboat Geyser continues to be active, with two eruptions in the past month: on November 12 and 24. ...
  • : HVO Haleakala GREEN/NORMAL - No activity of concern for Haleakalā. - Recent Volcano Observatory Activity Reports
    Dec 4, 2021 01:01 - No significant activity was recorded at Haleakalā Volcano during the past month. One microseismic event was detected south of Kanaio Beach, Maui. The continuously recording Global Positioning System (GPS) instrument atop Haleakalā (MAUI) recorded no significant deformation.
  • : HVO Loihi Seamount UNASSIGNED/UNASSIGNED - No activity of concern for Lō‘ihi. - Recent Volcano Observatory Activity Reports
    Dec 4, 2021 01:01 - No significant activity was recorded at Lō‘ihi Volcano during the past month. There were 32 small-magnitude earthquakes (less than M3.0) detected in the vicinity of the volcano. Plus one earthquake of M3.5 was recorded on November 30 about 11 km (7 miles) southeast of Loihi Seamount.
  • : AVO Pavlof ORANGE/WATCH - Unrest continues. Seismic activity remains elevated; explosions detected over the past day. - Recent Volcano Observatory Activity Reports
    Dec 5, 2021 22:32 - Unrest continues at Pavlof Volcano. Seismicity remains elevated and several explosions were detected by infrasound sensors over the past day. A diffuse ash cloud reaching as high as 10,000 feet above sea level and extending several tens of miles beyond the volcano was evident in web camera images and observed by a passing pilot. Minor ash emissions were also were observed intermittently in clear web camera images throughout the afternoon yesterday, but no ash emissions were observed in clear to partly cloudy satellite views of the volcano over the past day. Small ...
  • : HVO Hualalai GREEN/NORMAL - No activity of concern for Hualālai. - Recent Volcano Observatory Activity Reports
    Dec 4, 2021 01:01 - No significant activity was recorded at Hualālai Volcano during the past month. There were 3 small-magnitude earthquakes—the largest was M3.1—detected in the vicinity of the volcano. This earthquake activity is on par with previous months.
  • : AVO Great Sitkin ORANGE/WATCH - Unrest continues. Elevated surface temperatures at summit; no ash emissions observed. - Recent Volcano Observatory Activity Reports
    Dec 5, 2021 22:32 - Seismicity remains above background levels. Elevated surface temperatures at the summit were observed in one partly cloudy satellite image over the past day. Other satellite and web camera views of the volcano obscured by clouds and nothing significant noted. Lava effusion likely continues at a slow rate. It is possible that explosive activity could occur with little or no warning. Great Sitkin is monitored by local seismic and infrasound sensors, satellite data, web cameras, and remote infrasound and lightning networks.
  • : AVO Semisopochnoi ORANGE/WATCH - Unrest continues. Small explosions detected over the past day. - Recent Volcano Observatory Activity Reports
    Dec 5, 2021 22:32 - Low-level eruptive activity continues at Semisopochnoi volcano. Seismic activity at the volcano remains elevated but at low-levels over the past day. Several explosions were recorded by infrasound sensors. Clouds have obscured the volcano and nothing was observed in satellite or web camera data over the past day. Small eruptions producing minor ash deposits within the vicinity of the active north crater of Mount Cerberus and ash clouds usually under 10,000 ft above sea level have characterized the recent activity. Small explosions and associated ash emissions may ...
  • : HVO Kilauea ORANGE/WATCH - Kīlauea volcano is erupting; all lava activity is confined within Halemaʻumaʻu, in ... - Recent Volcano Observatory Activity Reports
    Dec 5, 2021 19:44 - Activity Summary: Kīlauea volcano has been erupting from a single vent in the western wall of Halemaʻumaʻu crater. As of this morning, December 5, 2021, the rate of eruption continues to be very low and any activity is difficult to view given the current weather. All recent lava activity has been confined within Halemaʻumaʻu crater in Hawai‘i Volcanoes National Park. Summit Observations: Lava effusion from the western vent decreased significantly Friday afternoon, accompanied by a decrease in volcanic tremor. Both remain low this morning. A minor ...

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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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