NMI Ahyi Seamount YELLOW/ADVISORY - Unrest continues. Satellite views cloudy.

Mar 13, 2025 23:40 - Unrest at Ahyi Seamount continues. A few hydroacoustic detections from the direction of Ahyi Seamount were received by a hydroacoustic array at Wake Island over the past week. Cloudy conditions obscured views of the area in satellite data—a plume of discolored water was last observed on March 3, 2025. Similar, faint plumes on the ocean's surface above Ahyi Seamount have been observed in satellite imagery sporadically since August 5, 2024.There are no local monitoring stations near Ahyi seamount, which limits our ability to detect and characterize volcanic unrest there. ...

HVO Kilauea ORANGE/WATCH - Kīlauea summit eruption paused on March 11. A new eruptive episode is likely to begin within the next 5-7 days in Hawai'i Volcanoes National Park.

Mar 13, 2025 20:08 - Activity Summary:  The Kīlauea summit eruption remains paused on March 11. Given current rates of inflation, a new eruptive episode is likely to begin within the next 5-7 days in Hawai'i Volcanoes National Park. Episode 13 ended at 3:13 p.m. HST on March 11. Lava flows unrelated to episode 13 continue to spread out on the eastern side of the crater. Kīlauea's current eruption in Halemaʻumaʻu crater within Kaluapele (the summit caldera) began on December 23, 2024. There have been 13 episodes of lava fountaining separated by pauses in activity. All eruptive activity ...

AVO Great Sitkin ORANGE/WATCH - Slow eruption of lava continues at Great Sitkin Volcano.

Mar 13, 2025 17:56 - Lava continues to erupt slowly in the summit crater of Great Sitkin Volcano. Small earthquakes continue at a low rate. Satellite and webcam views were obscured by clouds over the past day.The current eruption of Great Sitkin Volcano began with a single explosive event in May 2021. The ongoing eruption of lava at the summit began shortly afterward, in July 2021. The volcano is monitored using local seismic and infrasound sensors, satellite data and web cameras, and regional infrasound and lightning networks.

AVO Spurr YELLOW/ADVISORY - Shallow earthquake activity continues beneath Mount Spurr; gas emissions elevated.

Mar 13, 2025 17:56 - Unrest continues at Mount Spurr volcano. Seismicity remains elevated with numerous small, shallow volcanic earthquakes detected beneath the volcano over the past day. Satellite and webcam views were obscured by clouds. Overflights on March 7 and March 11 found significantly elevated volcanic gas emissions from the volcano. See the Information Statement released on March 12 for more details.AVO continues monitoring activity at Mount Spurr for signals indicating that the volcano is moving closer to an eruption. Based on previous eruptions, changes from current activity in ...

CALVO GREEN/NORMAL - CA volcanoes were at normal background levels of seismicity and deformation during the past week.

Mar 11, 2025 16:25 - Monitored CALIFORNIA VOLCANOESCurrent Volcano Alert Level: all NORMALCurrent Aviation Color Code: all GREENActivity Update: All volcanoes monitored by CalVO show normal background earthquake activity and deformation. Monitored volcanoes include Mount Shasta, Medicine Lake Volcano, Lassen Volcanic Center, Clear Lake Volcanic Field, Long Valley Volcanic Region, Coso Volcanic Field, Ubehebe Craters, and Salton Buttes.Past Week Observations for March 03 (0000h PST) to March 09 (2359h PDT):One earthquake greater than M1 was recorded near the Lassen Volcanic Center, with a ...

CVO Cascade Range GREEN/NORMAL - All volcanoes are at normal levels.

Mar 7, 2025 20:00 - Activity Update: All volcanoes in the Cascade Range of Oregon and Washington are at normal background activity levels. 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.Past Week Observations: During the past week, small earthquakes were detected at Mount Rainier, Mount St. Helens, and Mount Hood. All monitoring data are consistent with background activity levels in the Cascade Range.

HVO Ofu-Olosega GREEN/NORMAL - No activity of concern for Ofu-Olosega.

Mar 6, 2025 20:15 - No significant activity was detected at Ofu-Olosega Volcano during the past month. The USGS National Earthquake Information Center reported no earthquakes of magnitude 2.5 or greater in the vicinity of the volcano.

HVO Ta'u Island GREEN/NORMAL - No activity of concern for Taʻū Island

Mar 6, 2025 20:15 - No significant activity was detected at Taʻū Volcano during the past month. The USGS National Earthquake Information Center reported no earthquakes of magnitude 2.5 or greater in the vicinity of the volcano. Global Positioning System (GPS) instrument on Taʻū Island recorded no significant vertical deformation.

HVO Tutuila Island GREEN/NORMAL - No activity of concern for Tutuila Island

Mar 6, 2025 20:15 - No significant activity was detected at Tutuila Volcano during the past month. The USGS National Earthquake Information Center reported no earthquakes of magnitude 2.5 or greater in the vicinity of the volcano.

HVO Mauna Loa GREEN/NORMAL - No significant changes at Mauna Loa in the past month; slow inflation of the summit continues.

Mar 6, 2025 20:10 - Seismicity beneath Mauna Loa's summit and upper-elevation flanks has been low over the past month; approximately 66 small-magnitude earthquakes (most below M1.5) were detected, which is expected for the post-eruption phase of this volcano and similar to the previous month.Data from Global Positioning System (GPS) instruments on Mauna Loa continued to show only minor inflation near the summit as the volcano recovers from the 2022 eruption and magma replenishes the reservoir system. Gas and temperature data from a station on Mauna Loa's Southwest Rift Zone show that average ...

HVO Kama'ehuakanaloa UNASSIGNED/UNASSIGNED - No activity of concern for Kamaʻehuakanaloa.

Mar 6, 2025 20:10 - Seismicity has been low at Kamaʻehuakanaloa volcano (formerly Lōʻihi Seamount) over the past several months. There have been about 9 earthquakes in the past month, which is representative of background activity at the volcano; all earthquakes were of small magnitudes (below M3.0).

HVO Hualalai GREEN/NORMAL - No activity of concern for Hualālai.

Mar 6, 2025 20:10 - No significant activity was detected at Hualālai volcano during the past month. Seismic activity remained low, and was representative of background activity levels at the volcano; earthquakes were all below magnitude-3. The continuously recording Global Positioning System (GPS) instrument on Hualālai recorded no significant deformation in the past month.

HVO Haleakala GREEN/NORMAL - No activity of concern for Haleakalā.

Mar 6, 2025 20:10 - No significant activity was detected at Haleakalā volcano during the past month. Seismic activity remained low, and was representative of background activity levels at the volcano. The continuously recording Global Positioning System (GPS) instrument on Haleakalā shows no significant changes.

HVO Mauna Kea GREEN/NORMAL - No activity of concern for Mauna Kea.

Mar 6, 2025 20:10 - No significant activity was detected at Mauna Kea volcano during the past month. Seismic activity was at background levels at the volcano. The continuously recording Global Positioning System (GPS) instrument on Mauna Kea (operated by NASA’s Jet Propulsion Laboratory) showed no change.

AVO Atka volcanic complex GREEN/NORMAL - No further activity observed. Aviation Color Code and Alert Level has been changed to GREEN/NORMAL

Mar 3, 2025 23:52 - There has been no further explosive activity detected at the Atka volcanic complex since the small explosive event at 4:26 UTC on February 21 (7:26 pm on 2/20/25 AKST). Since then, seismicity has remained low. Thus, the Aviation Color Code and Alert Level are being reduced to GREEN/NORMAL. Further analysis of geophysical data confirms the source of the explosion as the summit lake region of Korovin Volcano. Satellite data from February 25, 2025 shows no evidence of hot material or ash at the surface. Our interpretation is that this was a gas-driven explosion, caused by ...

YVO Yellowstone GREEN/NORMAL - YVO Monthly Update: background seismicity and deformation

Mar 1, 2025 15:39 - SummaryYellowstone Caldera activity remains at background levels, with 42 located earthquakes in February (largest = M2.6). Deformation measurements indicate a small amount of caldera subsidence since early October. Recent Work and NewsJust before midnight on February 3, Steamboat Geyser had its first major eruption of the year.Happy 153rd birthday to Yellowstone National Park, which was founded on this day in 1872! SeismicityDuring February 2025, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, ...