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#45YearsAgo at #MountStHelens: M5.1 EQ, colossal landslides. Magma & hot fluids explode, surge outward like hot hurricane; column rises, ash falling. Hummocky debris flow buries valley. Snowpack melts, mud flows converge. 9-hr eruption. Everything is changed. #MSH45

How many geysers are in Yellowstone? What is the total thermal output? What are the largest and hottest thermal areas in the park? This weeks' #Yellowstone #CalderaChronicles goes into the numbers. ow.ly/fr0b50VMckG

Kīlauea summit lava fountains were active for about 10 hours during episode 22. V2cam captured the views shown here, just before sunrise on May 16. In case you missed the news, HVO installed another livestream camera, the V3cam, available here: url.usgs.gov/v3cam

All volcanoes in California showed normal activity last week. usgs.gov/programs/VHP/v… Though Medicine Lake volcano is part of the Cascades, it's a shield rather than a stratovolcano. Its broad, gentle slopes are built from layers of lava flows. (USGS photo by J. Donnelly-Nolan)

HVO Kilauea ORANGE/WATCH - Magnitude-4.2 earthquake near Pāhala, Island of Hawaiʻi volcanoes.usgs.gov/hans-public/no…

Though there aren’t as many earthquakes around Kīlauea summit during the ongoing eruption, the ground below Kaluapele is not exactly quiet. Learn about some of the interesting signals observed during the pauses in this week's Volcano Watch article: usgs.gov/observatories/…

Cascade Range volcanoes at normal background levels of activity this week: ow.ly/Ib7r50VWPs7. New radio shelter installed in early May near Kapowsin, WA, west of Mt. Rainier, will provide more robust radio connectivity with Rainier Lahar Detection System stations.

Episode 23 precursory activity continues at the summit of #Kīlauea...low-level spattering and flames have been visible in the livestream views. This video shows flames (likely hydrogen gas burning) within the north vent during the early evening of May 21.

Lava fountaining is underway at Kilauea! Streaming cameras: V1 - ow.ly/Fksw50VYAUT V2- ow.ly/eEnQ50VYAUS V3 - ow.ly/UqR650VYAUV Summit eruption information: ow.ly/tIph50VYAUR

All volcanoes in California were at normal levels of activity last week. usgs.gov/programs/VHP/v… These hills SE of Mount Konocti in the Clear Lake Volcanic Field are actually old lava flows and cones. Their oxidized soil inspired the name of this wine-growing region - Red Hills!

Episode 23 at the summit of Kīlauea was short but spectacular. On May 25, the north and south vents in Halemaʻumaʻu erupted for about six hours. Dual fountains were active for much of the episode, as shown in this is USGS Hawaiian Volcano Observatory webcam timelapse video.

Even at night, Landsat’s two sensors can offer useful views of the same scene. Check out the erupting Kilauea’s latest fountain episode captured by Landsat 8 on May 26, 2025. The USGS has live webcams of the Hawaiian volcano, too: ow.ly/n0En50VZzUN USGS Volcanoes🌋

USGS Hawaiian Volcano Observatory imagery analyses confirm that lava fountains erupted during episode 23 were the highest recorded so far in the ongoing #Kīlauea summit eruption. Fountains from the north vent reached nearly 350 meters (1,150 feet) around 5:30 p.m. HST on May 25.

#Spurr YELLOW/ADVISORY Information Statement May 28, 2025 The magma intrusion beneath Mount Spurr has stalled & the likelihood of an eruption continues to gradually decline. Spurr remains at an elevated state of unrest & an explosive eruption is still possible. (1/3)

Given the increasing airborne volcanic hazards associated with the ongoing Kīlauea eruption in Halemaʻumaʻu, HVO will issue a Volcanic Activity Notice (VAN) and Volcano Observatory Notice for Aviation (VONA) for episode start and stops moving forward: usgs.gov/observatories/…

Cascade Range volcanoes remain normal this week: ow.ly/HvAc50VY9rl. Congrats to Dr. Richard Waitt, who retires from CVO on May 31 after a 50-year career that included work on Mount St. Helens, the Missoula Floods, and writing “In the Path of Destruction" about 1980 events.