#MountStHelens May 18, 1980, 8:32 AM. A colossal landslide. Magma & hot fluids explode, surge outward like a hot hurricane. Column rises, ash falls for miles. Snowpack melts, mudflows converge, lahars move downvalley. A 9-hr eruption. Everything is changed.
#VolcanoAwarenessMonth

Cascade volcanoes at normal background levels of activity this week: usgs.gov/programs/VHP/v…. #CVO field teams were at #MountStHelens this week to conduct maintenance at monitoring stations. Team was able to troubleshoot issues with GPS and radio equipment (telemetry).

#FieldworkFriday #boglife Sound on! AVO staff spent 3 days at Mt. Edgecumbe/L'úx Shaa this week, conducting repairs on the monitoring network & investigating ash deposits from past eruptions. Both the monitoring stations & the ash sites are in bogs across Kruzof Island. (1/2)

#HVO geologists studying #Kilauea ’s 1924 eruptions are looking closely at ash. They’ve found at least 3 different magmas were interacting beneath Halema‘uma‘u at that time. Magma mixing could help explain why the eruptions were so explosive. #VolcanoWatch
usgs.gov/observatories/…

#MountStHelens 1980: Bulge on north flank 1 mile long, 1/2 mile wide. Many geologists agreed it was only a matter of time before it failed. Concern great enough that most stopped driving into the area to check instruments. Trips made by helicopter in case a hasty exit was needed.

One hour left! USGS, Washington Emergency Management Division and FEMA folks are answering questions on Reddit until 2 pm (Pacific). Ask us anything!
reddit.com/user/WaQuakePr…

Coming up in just a couple hours! Join us, USGS Volcanoes🌋 and FEMA Region 10 on reddit AMA! 🌋🌋🌋

#VolcanoAwarenessMonth Ask us Anything!

#MountStHelens 1980: Small bursts of steam & ash continue. Scientists believe a major eruption would be preceded by changes in seismicity or rate of bulging. They are uneasy, watching/tracking the volcano closely; hoping to provide adequate warning. #VolcanoAwarenessMonth

Hope to see you at the Science and Learning Center at Mount St. Helens on Saturday. It will be a blast!

We know you have questions....

Join us tomorrow from 11-1 Pacific Time over on Reddit for an Ask-Me-Anything event with USGS Volcanoes🌋, WA Emergency Management, and FEMA Region 10!

We'll be there to answer all your Volcano Questions!
(Link to the event coming tomorrow morning, ASAP!)

#VolcanoAwarenessMonth #VolcanoREADY !

Small increase in volcano seismic activity and minor ground uplift detected at Mount Spurr. No other significant signs of unrest observed. Volcano Alert Level/Color Code remain at NORMAL/GREEN. Full statement here: avo.alaska.edu/news/hans/DOI-…

Image: avo.alaska.edu/image/view/195…)

#VolcanoAwarenessMonth
Mount St. Helens is hot & the hype is everywhere. In 1980, volcanic activity is a novelty & everyone wants to gawk. But weeks of closures & roadblocks have residents on edge, growing weary of life near an active volcano with restrictions & uncertainties.

All volcanoes in California were at normal levels of activity last week. usgs.gov/programs/VHP/v… This spectrogram shows a long-period (LP) earthquake near Mammoth Mountain followed by two volcano-tectonic earthquakes. LPs are caused by water, gas, or magma moving underground.

Learn more about the 1924 explosive eruption at #Kilauea from Thomas Jaggar, who founded the Hawaiian Volcano Observatory in 1912. His description of the 1924 eruption was recorded in 1951 by Hawaiʻi Volcanoes National Park. usgs.gov/media/videos/1…
Hawaii Volcanoes NPS

#VolcanoAwarenessMonth
Late March 1980, media swoop in to cover #MountStHelens unrest. But weeks pass with no lava. As steam & ash blasts dwindle, so does interest. But on May 18, 1980 the catastrophic event is broadcast to the world. The power of explosive volcanism is humbling.

The Alaska Volcano Observatory's 2024 field season is upon us! There will be volcanoes. Helicopters. So many batteries. And hopefully not a lot of bears.
#Alaska #volcano
USGS Volcanoes🌋 UAF Geophysical Institute Alaska DGGS

The Alaska Volcano Observatory (AVO) has reestablished seismic monitoring instruments at Westdahl and Fisher volcanoes. Alert Level/ Color Code now at NORMAL/GREEN. Image: Thumbs up after a field visit to seismic station WTUG in 2023.

Coming up on May 14, May 20 and May 21, are opportunities to learn more about the May 1924 explosions at Halemaʻumaʻu. The in-person talk 'Sixteen Explosive Days at Kīlauea in May 1924' will be offered in Hawai‘i Volcanoes National Park & Lyman Museum.
usgs.gov/observatories/…

A team of scientists visited the new thermal area near Tern Lake to sample gases and measure temperatures. Today's #Yellowstone #CalderaChronicles shows how their data provide a snapshot into how thermal areas in Yellowstone develop.

ow.ly/kyBs50RAXjl