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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.Summit obscured by clouds in satellite images.
Oct 16, 2019 18:24 - No activity was observed on the local seismic stations at Cleveland and no eruptive activity was detected in regional infrasound data over the past day. Cleveland was obscured by cloudy weather in recent satellite and web camera images. 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 YELLOW/ADVISORY - No activity observed in seismic data; Satellite observations obscured by clouds
Oct 16, 2019 18:24 - No eruptive activity at Semisopochnoi has been observed on seismic or infrasound stations over the past day. Cloudy weather conditions obscured satellite images of the island. 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 YELLOW/ADVISORY - Low-level seismicity observed; Satellite observations obscured by clouds.
Oct 16, 2019 18:24 - Low-level seismicity continues to be observed at Shishaldin. The volcano was obscured by cloudy weather in satellite and web camera images. Shishaldin is monitored by local seismic and infrasound sensors, satellite data, a web camera, a telemetered geodetic network, and distant infrasound and lightning networks.

CVO Cascade Range GREEN/NORMAL - All volcanoes are at normal levels.
Oct 11, 2019 17:29 - 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: Seismic activity at Cascade Range volcanoes has been normal. During the past week, field crews visited Mount Rainier and Crater Lake to inspect and maintain monitoring stations.

HVO Mauna Loa YELLOW/ADVISORY - Mauna Loa is not erupting. Seismicity above background; continued summit inflation.
Oct 10, 2019 18:41 - Activity Summary: Mauna Loa Volcano is not erupting. Rates of deformation and seismicity have not changed significantly in the past week and persist above long-term background levels. Observations: During the past week, approximately 100 small-magnitude earthquakes (all smaller than M2.2) were detected beneath the upper elevations of Mauna Loa. Most of the earthquakes occurred at shallow depths of less than 5 km (~3 miles) below ground level. Global Positioning System (GPS) and Interferometric Synthetic Aperture Radar (InSAR) measurements show continued summit ...

HVO Kilauea GREEN/NORMAL - Low activity: no lava; slow inflation of summit + middle ERZ; water pond in summit crater
Oct 2, 2019 20:26 - Activity Summary: Kīlauea Volcano is not erupting. Monitoring data continue to show steady rates of seismicity and ground deformation, low rates of sulfur dioxide emission, and only minor geologic changes since the end of eruptive activity in September 2018. Water continues to pond at the bottom of Halema"uma"u inside the summit caldera. Observations: Monitoring data have shown no significant changes in volcanic activity during September. Rates of earthquake activity or seismicity across the volcano remain largely steady with three periods of increased ...

HVO Loihi Seamount UNASSIGNED/UNASSIGNED - No activity of concern for Lō"ihi.
Oct 2, 2019 20:26 - Lō"ihi's seismic activity remained very low over the past month. No earthquakes were located in the vicinity of the volcano's summit.

HVO Hualalai GREEN/NORMAL - No activity of concern for Hualālai.
Oct 2, 2019 20:26 - No significant activity was recorded at Hualālai Volcano over the past month. Two small-magnitude 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.
Oct 2, 2019 20:26 - 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 recorded no significant deformation during this time.

HVO Mauna Kea GREEN/NORMAL - No activity of concern for Mauna Kea.
Oct 2, 2019 20:26 - No significant activity was detected at Mauna Kea Volcano over the past month. Five earthquakes were detected in the vicinity of the volcano. 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 time.

CALVO GREEN/NORMAL - Activity Update: Volcanoes monitored by CalVO show normal levels of background seismicity and ...
Oct 2, 2019 17:45 - 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 1, 2019 (0000h PST) through September 30, 2019 (2359h PST): Mt ...

YVO Yellowstone GREEN/NORMAL - YVO Monthly Update: background seismicity and deformation
Oct 1, 2019 16:17 - Recent work and news Steamboat geyser continued it's record-setting year with 4 water eruptions in September, on September 3, 11, 17, and 25, bringing the total number of eruptions in 2019 to 37. Field work in Yellowstone National Park during the month of September included maintenance on GPS stations in the park. This involved replacing some GPS antennas, which in a few places resulted in an offset in the station position. Geologists and geochemists also visited the park to study hot spring activity and to collect gas and water samples for later ...