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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 - Earthquake activity slightly above background; cloudy satellite views
May 29, 2020 19:37 - Unrest at Great Sitkin Volcano has continued this week yet at lower levels than past weeks. Occasional small earthquakes were detected marking a general decline in seismic activity. Satellite and web camera views of the volcano were obscured by clouds throughout the week. There were no additional observations of outward unrest this week. Great Sitkin volcano is monitored by local seismic and infrasound sensors, satellite data, web cameras, and remote infrasound and lightning networks. Should conditions at the volcano change, this should be apparent in these data ...

AVO Semisopochnoi YELLOW/ADVISORY - Unrest continues with small earthquakes and occasional seismic tremor
May 29, 2020 19:37 - Unrest at Semisopochnoi volcano has continued over the past week. Seismicity remains above background with seismic tremor and occasional low-frequency earthquakes occurring over the past week. No eruptive activity was indicated in seismic or regional infrasound data. Clouds obscured satellite views of the volcano throughout the week and there were no observations of emissions or other outward signs of unrest. It remains possible for conditions at the volcano to escalate and explosive activity could occur with minimal precursory unrest. Semisopochnoi is monitored with a ...

AVO Shishaldin YELLOW/ADVISORY - Elevated seismicity; cloudy, slightly elevated surface temps, minor steaming
May 29, 2020 19:37 - Low-level unrest at Shishaldin Volcano has continued over the past week. Satellite and web camera observations of the volcano have been mostly obscured by clouds for much of the week, although weak to moderate elevated surface temperatures were observed at the summit on May 26--29. Minor amounts of sulfur dioxide gas were detected near the volcano in satellite data on May 28 and 29. The level of seismic activity remains above background with nearly continuous, weak tremor and occasional low-frequency earthquakes occurring over the past week. No evidence of eruptive ...

CVO Cascade Range GREEN/NORMAL - All volcanoes are at normal levels.
May 29, 2020 16:27 - 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 and Mount St. Helens, consistent with normal seismicity levels at each volcano.

HVO Mauna Loa YELLOW/ADVISORY - Mauna Loa is not erupting. Seismicity above background, summit inflation continues.
May 28, 2020 21:37 - 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 120 small-magnitude earthquakes on the volcano's summit and upper-elevation flanks. Most of these earthquakes occurred at shallow depths of less than 8 kilometers (~5 miles) below sea level. The largest earthquake was a magnitude-3 (M3) event that occurred below the volcano's western flank on May 24. Global ...

CALVO GREEN/NORMAL - CA volcanoes at normal background levels of seismicity and deformation during past week.
May 26, 2020 15:53 - 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 May 18, 2020 (0000h PDT) through May 24, 2020 (2359h PDT): Clear Lake Volcanic ...

HVO Loihi Seamount UNASSIGNED/UNASSIGNED - No eruptive activity. Brief earthquake swarm detected.
May 12, 2020 22:22 - SUMMARY Earthquake activity increased Sunday and Monday in the vicinity of Lōʻihi seamount, the youngest Hawaiian volcano located approximately 35 km (21.7 mi) southeast of Pāhala, at a water depth of ~1 km (~3300 ft) below sea level. There is no indication that a submarine eruption has occurred and there are no significant hazards of concern to the Island of Hawaiʻi at this time. OBSERVATIONS Beginning about 3:00 a.m. HST on May 11, 2020 and continuing through the morning of May 12, HVO detected more than 100 earthquakes beneath Lōʻihi, including 79 ...

AVO Cleveland UNASSIGNED/UNASSIGNED - No activity detected; status downgraded to UNASSIGNED
May 8, 2020 20:20 - No significant seismic or infrasound signals were observed from Cleveland over the past week. This continues the pattern of sustained decline in volcanic unrest over the last several months and has prompted the Alaska Volcano Observatory to downgrade the Aviation Color Code and Volcano Alert Level from YELLOW/ADVISORY to UNASSIGNED/UNASSIGNED on May 7. The last explosive eruption at Cleveland occurred on January 9, 2019, and was followed by the extrusion of a small mound of lava in the summit crater. Since then, there has been an overall decrease in detected surface ...

HVO Kilauea GREEN/NORMAL - No eruptive activity. Slow inflation of summit, rift zone. Rising water in summit crater lake
May 7, 2020 01:32 - Activity Summary: Kīlauea Volcano is not erupting. Monitoring data for the month of April 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 April. Rates of seismicity over the month were about 25 per cent lower than during the past month. Sulfur dioxide emission rates are low at the summit and are below detection limits at Puʻu ʻŌʻō ...

HVO Hualalai GREEN/NORMAL - No activity of concern for Hualālai.
May 7, 2020 01:32 - 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.
May 7, 2020 01:32 - No significant activity was recorded at Haleakalā Volcano over the past month. One small earthquake was recorded offshore south of the volcano. The continuously recording Global Positioning System (GPS) instrument atop Haleakalā (MAUI) recorded no significant deformation changes until it malfunctioned in late March.

HVO Mauna Kea GREEN/NORMAL - No activity of concern for Mauna Kea.
May 7, 2020 01:32 - 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 until it went offline in late March.

YVO Yellowstone GREEN/NORMAL - YVO Monthly Update: background seismicity and deformation
May 1, 2020 20:16 - Recent work and news We hope that everyone is safe and heathly during these challenging times. YVO is pleased to announce that we are transitioning to a new website look and feel. The new site is online now (https://usgs.gov/yvo) and will replace the current site on or around May 11. The same information will be available, but search functionality will be improved. YVO would also like to reiterate that the earthquake sequences occurring in central Idaho and near Salt Lake City are not related to Yellowstone, and they are not a sign of magma moving. These are ...