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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
Sep 2, 2021 20:35 - No significant activity was recorded at Mauna Kea Volcano during the past month. There were 30 small-magnitude earthquakes—nearly all less than M2.5—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 Hualalai GREEN/NORMAL - No activity of concern for Hualālai. - Recent Volcano Observatory Activity Reports
Sep 2, 2021 20:35 - No significant activity was recorded at Hualālai Volcano during the past month. There were 5 small-magnitude earthquakes—all less than M2.0—detected in the vicinity of the volcano. This earthquake count is on par with previous months.
- : HVO Loihi Seamount UNASSIGNED/UNASSIGNED - No activity of concern for Lō‘ihi. - Recent Volcano Observatory Activity Reports
Sep 2, 2021 20:35 - No significant activity was recorded at Lō‘ihi Volcano during the past month. There were no earthquakes larger than M1.0 detected in the vicinity of the volcano.
- : YVO Yellowstone GREEN/NORMAL - YVO Monthly Update: background seismicity and deformation - Recent Volcano Observatory Activity Reports
Sep 1, 2021 18:50 - Recent work and news August is a busy season for visitors in Yellowstone, but most geologic work during the month happened in the lab and office, with Yellowstone Volcano Observatory scientists analyzing data collected during the first few months of the summer. One exception was work on Yellowstone Lake, where geologists collected core samples from the lake bottom that will help better identify and understand past hydrothermal explosions, the deposits of which are preserved as distinct layers in the sediments that make up the lake floor. Steamboat Geyser did not ...
- : AVO Katmai GREEN/NORMAL - Resuspended ash due to strong northwesterly winds; no eruption - Recent Volcano Observatory Activity Reports
Aug 28, 2021 21:37 - Strong northwesterly winds in the vicinity of Katmai and the Valley of Ten Thousand Smokes have picked up loose volcanic ash erupted during the 1912 Novarupta-Katmai eruption and carried it to the southeast toward Kodiak Island today. The National Weather Service has issued a SIGMET for this low-level event and suggests that the maximum cloud height is 6,000 ft above sea level. This phenomenon is not the result of recent volcanic activity and occurs during times of high winds and dry snow-free conditions in the Katmai area and other young volcanic areas of Alaska. No ...
- : HVO Haleakala GREEN/NORMAL - No activity of concern for Haleakalā. - Recent Volcano Observatory Activity Reports
Sep 2, 2021 20:35 - No significant activity was recorded at Haleakalā Volcano during the past month. There was 1 earthquake detected in the vicinity of the volcano, a M2.8 event on August 13, along the offshore southwest flank approximately 20 kilometers (13 miles) south of La Perouse Bay. The continuously recording Global Positioning System (GPS) instrument atop Haleakalā (MAUI) recorded no significant deformation.
- : AVO Atka volcanic complex GREEN/NORMAL - Small earthquakes and weak tremor declined to background levels - Recent Volcano Observatory Activity Reports
Aug 27, 2021 20:26 - Earthquake activity associated with the seismic swarm that began on August 10 has returned to background levels over the past week. In response to this decrease in seismicity, the Aviation Color Code and Alert Level were lowered to GREEN/NORMAL earlier today (August 27). The Atka volcanic complex is monitored by local seismic and infrasound sensors, satellite data, and regional lightning detection instruments.
- : CVO Cascade Range GREEN/NORMAL - All volcanoes are at normal levels. - Recent Volcano Observatory Activity Reports
Sep 10, 2021 16:30 - 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 Baker, Mount Rainier, and Mount St. Helens, consistent with background seismicity at each volcano. This week field crews worked at Glacier Peak to perform geologic field ...
- : CALVO GREEN/NORMAL - CA volcanoes at normal background levels of seismicity and deformation during past week. - Recent Volcano Observatory Activity Reports
Sep 14, 2021 16:46 - 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 September 6, 2021 (0000h PDT) through September 12, 2021 (2359h PDT): Clear ...
- : AVO Cleveland YELLOW/ADVISORY - No volcanic activity noted in satellite images or geophysical data - Recent Volcano Observatory Activity Reports
Sep 16, 2021 19:57 - Clouds obscured satellite and web camera images over the last day. No significant seismic or infrasound activity was detected. 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. When operational, Cleveland volcano is monitored by only two seismic stations, which restricts AVO's ...
- : AVO Great Sitkin ORANGE/WATCH - No explosions or ash emissions observed; clouds obscured imagery - Recent Volcano Observatory Activity Reports
Sep 16, 2021 19:57 - No explosions or ash emissions were detected in seismic, infrasound, or satellite data. Clouds obscured all views of the summit area in satellite and web camera images. Lava effusion at the summit may continue undetected behind cloud cover. There is no indication of how long lava effusion will continue during the current eruption, and it is possible that explosive activity could occur with little or no warning. Great Sitkin Volcano is monitored by local seismic and infrasound sensors, satellite data, web cameras, and remote infrasound and lightning networks.
- : AVO Semisopochnoi ORANGE/WATCH - Small explosions detected; clouds obscured imagery - Recent Volcano Observatory Activity Reports
Sep 16, 2021 19:57 - Local seismic stations on Semisopochnoi Island detected several small explosions over the last day from the north crater of Mount Cerberus. Satellite images did not detect any ash signatures, suggesting any emissions remained below the ~10,000 ft. asl cloud top height. Clouds obscured all web camera images. Small eruptions producing minor ash deposits within the vicinity of the active north crater of Mount Cerberus and ash clouds usually under 10,000 feet above sea level have characterized the recent activity, which shows no signs of abating. Small explosions may ...
- : HVO Kilauea YELLOW/ADVISORY - Kīlauea Volcano is not erupting. Decreased ground deformation and earthquake activity ... - Recent Volcano Observatory Activity Reports
Sep 14, 2021 18:55 - Activity Summary: Kīlauea Volcano is not erupting. Following the recent intrusion of magma beneath the surface in the area south of Kīlauea caldera, which slowed substantially on August 30, earthquake rates and ground deformation in this area have remained near pre-intrusion levels. Other monitoring data streams, including sulfur dioxide emission rates and webcam views, show no significant changes. Summit Observations: Over the past week, 13 small-magnitude earthquakes—all below M2.5—were detected beneath the summit region of Kīlauea. These earthquakes occurred ...
- : HVO Mauna Loa YELLOW/ADVISORY - Mauna Loa is not erupting. Seismicity remains slightly above background. - Recent Volcano Observatory Activity Reports
Sep 16, 2021 18:11 - Activity Summary: Mauna Loa Volcano is not erupting. Rates of seismicity at the summit remain slightly above long-term background levels, but have not changed significantly over the past week. Other monitoring data streams—ground deformation, gas discharge, and visual observations—show no significant changes. Observations: During the past week, HVO seismometers recorded 66 small-magnitude earthquakes—all below M2.8—beneath the summit and upper-elevation flanks of Mauna Loa. The majority of these earthquakes occurred at shallow depths less than 8 kilometers (5 ...
- : NMI Pagan YELLOW/ADVISORY - No volcanic activity detected at Pagan over the last week - Recent Volcano Observatory Activity Reports
Sep 17, 2021 00:27 - There have been no observations of eruptive activity or volcanic gas emissions at Pagan in the last week. It is unclear at this time whether the apparent pause in ash emission since September 6 indicates an end to eruptive activity or just a temporary hiatus. Further ash emissions are possible and could occur at any time. Pagan is monitored remotely with satellite data, an intermittently operational seismo-acoustic network on Saipan, distant seismic stations in Guam and Chichijima, Japan, and hydroacoustic data from Wake Island. These observations might detect ...
- : AVO Pavlof ORANGE/WATCH - Elevated seismicity continues; clouds obscured imagery - Recent Volcano Observatory Activity Reports
Sep 16, 2021 19:57 - Periods of increased seismic tremor were detected over the last day, but with no clear explosion signals. Clouds obscured all views of the summit area in satellite and web camera images. Small explosions accompanied by low-level ash emissions could happen at any time, and are typically a hazard in the immediate vicinity of the summit. The level of unrest at Pavlof can change quickly and the progression to more significant eruptive activity can occur with little or no warning. Pavlof Volcano is monitored by local seismic and infrasound sensors, satellite data, web ...
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