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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 Cleveland YELLOW/ADVISORY - No eruptive activity observed
Dec 10, 2019 20:40 - No eruptive activity at Cleveland has been detected in local seismic or infrasound data over the past day. Weather conditions were cloudy over the past 24 hours. Minor steaming was observed in web camera images from this morning. 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 ...

AVO Semisopochnoi ORANGE/WATCH - No eruptive activity evident today. Seismicity remains elevated.
Dec 10, 2019 20:40 - Seismicity remained elevated at Semisopochnoi over the past 24 hours. No significant ash emissions or other surface activity were detected in a mix of cloudy and clear satellite imagery from the past day. Semisopochnoi is monitored with an on-island seismic network and remotely by satellite and lightning sensors. An infrasound array on Adak Island may detect explosive emissions from Semisopochnoi with a slight delay (approximately 13 minutes) if atmospheric conditions permit.

AVO Shishaldin ORANGE/WATCH - Elevated seismicity and surface temperatures.
Dec 10, 2019 20:40 - Seismicity remained elevated over the past 24 hours. Weather conditions were mostly cloudy at the volcano during the past day but satellite images continue to show elevated surface temperatures when weather is clear. Some web camera views were clear but showed no obvious lava fountaining or ash emission. Episodic explosions and lava flow front collapses resulting in low-level ash plumes can occur with little warning. Shishaldin is monitored by local seismic and infrasound sensors, satellite data, web cameras, a telemetered geodetic network, and distant ...

CVO Cascade Range GREEN/NORMAL - All volcanoes are at normal levels.
Dec 6, 2019 21:27 - 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: Monitoring systems show that activity at Cascade Range volcanoes remained at background levels throughout the week.

HVO Kilauea GREEN/NORMAL - Low activity: no lava; slow inflation of summit + middle ERZ; water pond in summit crater
Dec 5, 2019 21:11 - Activity Summary: Kīlauea Volcano is not erupting. Monitoring data continue to show steady 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 during November. Over the past month, about a dozen DI events occurred beneath the summit. Seismic stations detected over 1800 earthquakes in the vicinity of the volcano, which is an increase of ~10% from last month. Rates of ...

HVO Loihi Seamount UNASSIGNED/UNASSIGNED - No activity of concern for Lō"ihi.
Dec 5, 2019 21:11 - Lō"ihi's seismic activity remained very low over the past month. Three earthquakes were located in the vicinity of the volcano's summit.

HVO Hualalai GREEN/NORMAL - No activity of concern for Hualālai.
Dec 5, 2019 21:11 - No significant activity was recorded at Hualālai Volcano over the past month. Nine microseismic events were 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.
Dec 5, 2019 21:11 - No significant activity was recorded at Haleakalā Volcano over the past month. No earthquakes were recorded in the vicinity of the volcano. The continuously recording Global Positioning System (GPS) instrument atop Haleakalā (MAUI) recorded no significant deformation during this time.

HVO Mauna Kea GREEN/NORMAL - No activity of concern for Mauna Kea.
Dec 5, 2019 21:11 - No volcanic activity was detected at Mauna Kea Volcano over the past month. Earthquake activity was elevated over the past month, with about 40 earthquakes occurring within the vicinity of the volcano. A M4.9 event occurred on Mauna Kea's east flank at a depth of 32km (20 miles) on Nov 11, 2019 at 16:35UTC (06:35HST). There were over 20 aftershocks associated with this event. A single, continuously recording Global Positioning System (GPS) receiver atop Mauna Kea (operated by NASA's Jet Propulsion Laboratory) recorded no significant changes in deformation during this ...

HVO Mauna Loa YELLOW/ADVISORY - Mauna Loa is not erupting. Seismicity is above background w/ continued summit inflation.
Dec 5, 2019 19:55 - 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, approximately 70 small-magnitude earthquakes (nearly all smaller than M2.0) were detected beneath the upper elevations of Mauna Loa. Most of the earthquakes occurred at shallow depths of less than 6 km (~4 miles) below sea level. Global Positioning System (GPS) and Interferometric Synthetic Aperture Radar (InSAR) measurements show continued summit ...

CALVO GREEN/NORMAL - Activity Update: Volcanoes monitored by CalVO show normal levels of background seismicity and ...
Dec 2, 2019 18:46 - 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 November 1, 2019 (0000h PST) through November 30, 2019 (2359h PST): Mount ...

YVO Yellowstone GREEN/NORMAL - YVO Monthly Update: background seismicity and deformation
Dec 2, 2019 16:59 - Recent work and news There were 3 water eruptions of Steamboat geyser during the month, on November 8, 17, and 27. This brings the total number of eruptions in 2019 to 45. The Yellowstone Volcano Observatory is pleased to announce the publication of a new information product--an annual report! The report covers calendar year 2017, summarizing activity, including earthquakes and ground deformation, as well as efforts to monitor water and gas chemistry, growth of hot spring terraces as mapped with aerial imagery, research into hydrothermal vents at the bottom of ...

AVO Pavlof GREEN/NORMAL - Aviation Color Code reduced to GREEN and the Volcano Alert Level to NORMAL this week.
Nov 9, 2019 00:40 - Aviation Color Code reduced to GREEN and the Volcano Alert Level to NORMAL this week and Pavlof is at background levels of activity. The level of unrest at Pavlof can change quickly and the progression to eruptive activity can occur with little or no warning. We continue to monitor Pavlof closely and will provide any new information about the status of the volcano when or if it becomes available.