USGS Volcanoes🌋

FWIW: official USGS volcano information will always come from accounts that have the handles @USGSVolcanoes, @alaska_avo, & @USGS and are linked from our web pages. Visit usgs.gov/programs/VHP/c… for info.

NMI Ahyi Seamount UNASSIGNED/UNASSIGNED - No sign of continued submarine eruption; Aviation Color Code and Volcano Alert Level lowered to UNASSIGNED volcanoes.usgs.gov/hans-public/no…

NMI Ahyi Seamount UNASSIGNED/UNASSIGNED - No sign of continued submarine eruption; Aviation Color Code and Volcano Alert Level lowered to UNASSIGNED. volcanoes.usgs.gov/hans-public/no…

Hot springs on the Goosenest? Not so fast! A historic report on volcanoes in northern California by the volcanologist Howell Williams made a curious claim about Goosenest volcano. The Goosenest is north of Mount Shasta and is one of three large shield volcanoes which trace out…

Misty morning views of lava fountains during #Kīlauea summit eruption episode 29, framed by a rainbow, were followed by clearer views in the afternoon. Episode 29 was just over 13 hours long on July 20, with fountains reaching less than 330 feet (100 meters) high.

Calculating earthquake magnitudes can be a challenge in places like Yellowstone, where lots of small seismic events can happen in rapid succession, but maybe AI can help? There's nothing artificial about today's #Yellowstone #CalderaChronicles! ow.ly/5rjq50WoOzS

Kilauea Message 2025-07-20 19:25:18 HST: Glow will persist across the vent area and Halema'uma'u crater floor tonight due to continued creep of molten material. Small collapses of partly molten material can feed small lava flows through the night.

HVO Kilauea ORANGE/WATCH - Episode 29 of the ongoing Halemaʻumaʻu eruption ended abruptly around 6:35 p.m. HST on July 20. volcanoes.usgs.gov/hans-public/no…

Kilauea Message 2025-07-20 18:45:55 HST: Episode 29 ended at 6:35 PM after just over 13 hours of fountaining and 14 hours of eruption. Deflation was 18.5 microradians and produced about 9 million cubic yards (7 million cubic meters) of lava that covered over 80% of Halema'uma'u.

Kilauea Message 2025-07-20 11:28:54 HST: By 11:15 AM, after 6 hours of continuous episode 29 lava fountaining, UWD tiltmeter had recorded 10.8 microradians of deflation. During the past three eruptive episodes, UWD recorded 15.0, 16.3, and 18.5 microradians of deflation.

Kilauea Message 2025-07-20 09:30:46 HST: Episode 29 is certainly different. The "nozzle" like shape of the vent exit has broken down allowing lava to spray in multiple directions and preventing the fountains from growing higher. Deflation has exceeded 7 microradians.

Kilauea Message 2025-07-20 08:31:46 HST: Though the north vent has been the primary host of episode 29 activity, the south vent has been spattering since about 6:05 AM; it last erupted in episode 27 and was completely absent from episode 28.

Kilauea Message 2025-07-20 05:40:33 HST: Episode 29 fountains are currently erupting more sideways than vertically, creating an arcing fountain from the north vent.Flows have covered an estimated 5-10% of the floor of Halema'uma'u crater at this time.

HVO Kilauea ORANGE/WATCH - Episode 29 high fountains of the ongoing Halemaʻumaʻu eruption began around 5:15 a.m. HST on July 20. volcanoes.usgs.gov/hans-public/no…

Kilauea Message 2025-07-20 05:24:15 HST: Episode 29 transitioned to high fountains at approximately 5:15 AM. Fountains transitioned from dome fountains less than 100 feet high to more vertical fountains over 200 feet high accompanied by increased tremor and deflation rates.

HVO Kilauea ORANGE/WATCH - Precursory low-level activity for episode 29 of the ongoing Halemaʻumaʻu eruption began around 3:55 a.m. HST on July 20. volcanoes.usgs.gov/hans-public/no…

Kilauea Message 2025-07-20 04:39:23 HST: Precursory spattering began at 3:55 AM followed by lava overflowing the vent at 4:11 AM. Vigorous low fountains and lava flows continue at this time. TEpisode 29 high fountains are expected today, likely within a few hours or less.

Kilauea Message 2025-07-18 20:30:34 HST: Moderate glow has returned to the north vent tonight suggesting the plug may be breaking down. The cracks in the cone just above the vent also continue to glow. Tremor levels remain low but elevated and slow inflation continues.

#Kīlauea is in a bit of a slump after 28 episodes of fountaining. Summit inflationary tilt has reached the level recorded at the onset of episode 28, indicating that the start of episode 29 is close. However, the tephra cone in Halemaʻumaʻu slumped into the north vent in the days…

Cascade Range volcanoes at normal background levels of activity this week: ow.ly/s0hR50Ws2UG. This infographic updates statistics on the earthquake swarm at Rainier, which is continuing at low rates. More info at ow.ly/Iw0J50Ws2UI.

Happy birthday to the eruption of Great Sitkin, in Alaska!