How many eruptions have there been in the Cascades during the last 4,000 years?
Eruptions in the Cascades have occurred at an average rate of one to two per century during the last 4,000 years. Future eruptions are certain.
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How would an eruption of Mount Rainier compare to the 1980 eruption of Mount St. Helens?
How dangerous is Mount Rainier?
How old is Mount St. Helens?
How far did the ash from Mount St. Helens travel?
Do earthquakes large enough to collapse buildings and roads accompany volcanic eruptions?
Why is it important to monitor volcanoes?
When did Lassen Peak last erupt?
How often does Mount Shasta erupt?
What was the largest volcanic eruption in the 20th century?
Will extinct volcanoes on the East Coast of the U.S. erupt again?
Which volcanoes in the conterminous United States have erupted since the Nation was founded?
Where does the United States rank in the number of volcanoes?
When volcanoes fall down—Catastrophic collapse and debris avalanches
Despite their seeming permanence, volcanoes are prone to catastrophic collapse that can affect vast areas in a matter of minutes. Large collapses begin as gigantic landslides that quickly transform to debris avalanches—chaotically tumbling masses of rock debris that can sweep downslope at extremely high velocities, inundating areas far beyond the...
Siebert, Lee; Reid, Mark E.; Vallance, James W.; Pierson, Thomas C.
2018 update to the U.S. Geological Survey national volcanic threat assessment
When erupting, all volcanoes pose a degree of risk to people and infrastructure, however, the risks are not equivalent from one volcano to another because of differences in eruptive style and geographic location. Assessing the relative threats posed by U.S. volcanoes identifies which volcanoes warrant the greatest risk-mitigation efforts by the U....
Ewert, John W.; Diefenbach, Angela K.; Ramsey, David W.
Field-trip guides to selected volcanoes and volcanic landscapes of the western United States
The North American Cordillera is home to a greater diversity of volcanic provinces than any comparably sized region in the world. The interplay between changing plate-margin interactions, tectonic complexity, intra-crustal magma differentiation, and mantle melting have resulted in a wealth of volcanic landscapes. Field trips in this guide...
U.S. Geological Survey Volcano Hazards Program—Assess, forecast, prepare, engage
At least 170 volcanoes in 12 States and 2 territories have erupted in the past 12,000 years and have the potential to erupt again. Consequences of eruptions from U.S. volcanoes can extend far beyond the volcano’s immediate area. Many aspects of our daily life are vulnerable to volcano hazards, ...
Stovall, Wendy K.; Wilkins, Aleeza M.; Mandeville, Charles W.; Driedger, Carolyn L.
A sight "fearfully grand": eruptions of Lassen Peak, California, 1914 to 1917
On May 22, 1915, a large explosive eruption at the summit of Lassen Peak, California, the southernmost active volcano in the Cascade Range, devastated nearby areas and rained volcanic ash as far away as 280 miles to the east. This explosion was the most powerful in a series of eruptions during 1914–17 that were the last to occur in the...
Clynne, Michael A.; Christiansen, Robert L.; Stauffer, Peter H.; Hendley, James W.; Bleick, Heather A.
Mount St. Helens, 1980 to now—what’s going on?
Mount St. Helens seized the world’s attention in 1980 when the largest historical landslide on Earth and a powerful explosive eruption reshaped the volcano, created its distinctive crater, and dramatically modified the surrounding landscape. An enormous lava dome grew episodically in the crater until 1986, when the volcano became relatively quiet...
Dzurisin, Daniel; Driedger, Carolyn L.; Faust, Lisa M.
Mount Rainier: living safely with a volcano in your backyard
Majestic Mount Rainier soars almost 3 miles (14,410 feet) above sea level and looms over the expanding suburbs of Seattle and Tacoma, Washington. Each year almost two million visitors come to Mount Rainier National Park to admire the volcano and its glaciers, alpine meadows, and forested ridges. However, the volcano's beauty is deceptive - U.S....
Driedger, Carolyn L.; Scott, William E.
Eruptions in the Cascade Range during the past 4,000 years
Volcanoes have been erupting in the Cascade Range for over 500,000 years. During the past 4,000 years eruptions have occurred at an average rate of about 2 per century. This chart shows 13 volcanoes on a map of Washington, Oregon, and northern California and time lines for each showing the ages of their eruptions.
Myers, Bobbie; Driedger, Carolyn L.
Volcano Hazards - A National Threat
When the violent energy of a volcano is unleashed, the results are often catastrophic. The risks to life, property, and infrastructure from volcanoes are escalating as more and more people live, work, play, and travel in volcanic regions. Since 1980, 45 eruptions and 15 cases of notable volcanic unrest have occurred at 33 U.S. volcanoes. Lava...
What are volcano hazards?
No abstract available.
Myers, Bobbie; Brantley, Steven R.; Stauffer, Peter; Hendley, James W.
Volcanoes!
Volcanoes is an interdisciplinary set of materials for grades 4-8. Through the story of the 1980 eruption of Mount St. Helens, students will answer fundamental questions about volcanoes: "What is a volcano?" "Where do volcanoes occur and why?" "What are the effects of volcanoes on the Earth system?" "What are the risks and the benefits of living...
Which U.S. volcanoes pose a threat?
USGS Volcanic Threat Assessment updates the 2005 rankings.
May is Volcano Preparedness Month in Washington State
May is Volcano Preparedness Month in Washington, providing residents an opportunity to become more familiar with volcano hazards in their communities and learn about steps they can take to reduce potential impacts.
PubTalk 2/2018 — USGS Cascades Volcano Observatory
Title: The USGS Cascades Volcano Observatory - Research, monitoring, and the science of preparing society for low-probability, high-consequence events
- Volcanoes in the Cascade Range erupt twice per century on average, with eruptions often lasting for years.
- Although eruptions are generally not as high-consequence as large earthquakes, they are still
Mount Rainier looms over the Puyallup Valley, Washington
Mount Rainier volcano looms over Puyallup Valley, near Orting, Washington.
Volcano Hazards
The United States has 169 active volcanoes. More than half of them could erupt explosively, sending ash up to 20,000 or 30,000 feet where commercial air traffic flies. USGS scientists are working to improve our understanding of volcano hazards to help protect communities and reduce the risks.
Video Sections:
- Volcanoes: Monitoring Volcanoes
The 20th Century's Greatest Volcanic Eruption- Mt Katmai 100 Years Later
Bill Burton discusses the June 6-8, 1912 eruption of Mount Katmai in Alaska which was 30 times larger than the eruption of Mt. St. Helens in 1980. This eruption caused widespread devastation, and inspired heroic efforts at survival by the local people. Burton returns to this topic a century later and explains what lessons the Mount Katmai eruption provides for modern-day
...Volcano Web Shorts 2: Debris Flows
Debris flows are hazardous flows of rock, sediment and water that surge down mountain slopes and into adjacent valleys. Hydrologist Richard Iverson describes the nature of debris-flow research and explains how debris flow experiments are conducted at the USGS Debris Flow Flume, west of Eugene, Oregon. Spectacular debris flow footage, recorded by Franck Lavigne of the
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Mount Adams, WA
A photograph of Mount Adams, Washington. This image was taken as part of the Land Cover Trends Project field varification for land cover data.
Mount Hood, OR
View of Mount Hood from Pittock Mansion, Portland, OR.
Mount St. Helens: May 18, 1980
USGS scientists recount their experiences before, during and after the May 18, 1980 eruption of Mount St. Helens. Loss of their colleague David A. Johnston and 56 others in the eruption cast a pall over one of the most dramatic geologic moments in American history.
Mount St. Helens: A Catalyst for Change
The May 18, 1980 eruption of Mount St. Helens triggered a growth in volcano science and volcano monitoring. Five USGS volcano observatories have been established since the eruption. With new technologies and improved awareness of volcanic hazards USGS scientists are helping save lives and property across the planet.
Mount St. Helens 2004-2008 Eruption: A Volcano Reawakens
Mount St. Helens reawakened in late September 2004. Small magnitude earthquakes beneath the 1980-1986 lava dome increased in frequency and size, and a growing welt formed on the southeast margin of the previous lava dome and nearby portions of Crater Glacier. On October 1, 2004, the first of several explosions shot a plume of volcanic ash and gases from a vent on the
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