USGS Volcano Alerts

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Recent Volcano Observatory Activity Reports

  • : HVO Mauna Kea GREEN/NORMAL - No activity of concern for Mauna Kea. - Recent Volcano Observatory Activity Reports
    Oct 1, 2020 19:54 - No significant activity was detected at Mauna Kea Volcano over the past month. There were 11 small magnitude earthquakes detected beneath the summit and flanks of the volcano, similar to average long-term earthquake rates. 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
  • : HVO Loihi Seamount UNASSIGNED/UNASSIGNED - No activity of concern for Lō‘ihi. - Recent Volcano Observatory Activity Reports
    Oct 1, 2020 19:54 - Following the May 11th earthquake swarm on Lō‘ihi Seamount, earthquake activity has decreased and returned to average long-term earthquake rates, with only one earthquake detected in the vicinity of the seamount.
  • : YVO Yellowstone GREEN/NORMAL - YVO Monthly Update: background seismicity and deformation - Recent Volcano Observatory Activity Reports
    Oct 1, 2020 17:11 - Recent work and news YVO wishes everyone continued safety and health during these challenging times. In September, field crews began removing semi-permanent GPS stations from high-elevation sites prior to the onset of winter. Low-elevation sites will be recovered in October, and the stations will be redeployed starting in May 2021. Maintenance work was also completed on permanent GPS and seismic stations in several areas of Yellowstone National Park, ensuring that the networks will be operational through the coming winter months. Steamboat Geyser continues to be ...
  • : HVO Kilauea GREEN/NORMAL - No eruptive activity. Slow inflation of summit, rift zone. Rising water in summit crater lake - Recent Volcano Observatory Activity Reports
    Oct 1, 2020 19:54 - Activity Summary: Kīlauea Volcano is not erupting. Monitoring data for the month of September 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: There were approximately 1450 earthquakes during the month of September at Kīlauea, an increase of roughly 35% from the number of earthquakes recorded in August. Over the past month, summit tiltmeters recorded 4 deflation-inflation events—a significant decrease from ...
  • : HVO Hualalai GREEN/NORMAL - No activity of concern for Hualālai. - Recent Volcano Observatory Activity Reports
    Oct 1, 2020 19:54 - No significant activity was recorded at Hualālai Volcano over the past month. There were three small earthquakes detected 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. - Recent Volcano Observatory Activity Reports
    Oct 1, 2020 19:54 - No significant activity was recorded at Haleakalā Volcano over the past month. There was one M3.7 deep earthquake detected to the north of the volcano. The continuously recording Global Positioning System (GPS) instrument atop Haleakalā (MAUI) recorded no significant deformation.
  • : HVO Mauna Loa YELLOW/ADVISORY - Mauna Loa is not erupting. Seismicity above background, summit inflation continues. - Recent Volcano Observatory Activity Reports
    Oct 15, 2020 18:40 - 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: Over the past week, HVO seismometers recorded approximately 80 small-magnitude earthquakes - all below M2.5 - beneath the volcano's summit and upper-elevation flanks. The majority of these earthquakes occurred at shallow depths of less than 8 kilometers (approximately 5 miles) below ground level. Global Positioning System (GPS) measurements continue to indicate slow, ...
  • : AVO Pavlof GREEN/NORMAL - No signs of unrest in seismic, satellite or web camera data. - Recent Volcano Observatory Activity Reports
    Oct 16, 2020 20:18 - There have been no signs of unrest over the past several weeks, and on October 14 the Alaska Volcano Observatory lowered the Aviation Color Code and Alert Level to GREEN/NORMAL. Seismicity remains very low and satellite and web camera observations showed typical minor steaming from the summit during periods of clear weather. The level of unrest at Pavlof can change quickly and the progression to eruptive activity with ash emissions and lava fountaining can occur with little or no warning. Pavlof is one of the most frequently active volcanoes in Alaska and last erupted ...
  • : AVO Semisopochnoi YELLOW/ADVISORY - Seismic activity is low; no unusual eruptive activity detected - Recent Volcano Observatory Activity Reports
    Oct 21, 2020 20:01 - No significant activity was noted on seismic networks, regional infrasound sensors, or in partly cloudy satellite data. Semisopochnoi is monitored by local seismic sensors, satellite data, and 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 atmospheric conditions permit.
  • : AVO Westdahl GREEN/NORMAL - Seismic network operational; alert level changed to GREEN/NORMAL - Recent Volcano Observatory Activity Reports
    Oct 15, 2020 20:25 - The Alaska Volcano Observatory (AVO) has reestablished seismic monitoring instruments at Westdahl volcano 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 monitor seismic, satellite, infrasound, and lightning data, and reports from pilots and ground observers to detect signs of eruptive activity.
  • : AVO Great Sitkin GREEN/NORMAL - Aviation Color Code and Volcano Alert level lowered to GREEN/NORMAL - Recent Volcano Observatory Activity Reports
    Oct 21, 2020 23:21 - Seismicity at Great Sitkin has been steadily decreasing for the past several months and is now at background levels. No eruptive activity or unusual surface temperatures have been observed in clear satellite imagery. The Alaska Volcano Observatory is returning the Aviation Color Code and Alert Level to GREEN/NORMAL to reflect these background conditions. AVO will continue to monitor the volcano using seismic, infrasound, web camera, and satellite observations. Great Sitkin is monitored with a local real-time seismic network, which will typically allow AVO to detect ...
  • : CALVO GREEN/NORMAL - CA volcanoes at normal background levels of seismicity and deformation during past week. - Recent Volcano Observatory Activity Reports
    Oct 20, 2020 16:48 - 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 October 12, 2020 (0000h PDT) through October 18, 2020 (2359h PDT): Clear Lake ...
  • : CVO Cascade Range GREEN/NORMAL - All volcanoes are at normal levels. - Recent Volcano Observatory Activity Reports
    Oct 16, 2020 21:34 - 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 and Mount St. Helens over the last week, consistent with normal background seismicity.

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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 20th year, author of multimedia CDs and DVDs, loves the outdoors, his family, his geeky skill-set, and lives in rural Missouri, just a few miles from the Big Muddy. Always ready to help others, he shares what he learns on multiple blogs, 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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