Mount St. Helens - Current Volcanic Activity
Harmonic tremor - Continuous rhythmic earthquakes in the Earth's upper lithosphere that can be detected by seismographs. Harmonic tremors often precede or accompany volcanic eruptions.
Cascade Range Current Update - U.S. Geological Survey, Vancouver, Washington and University of Washington, Pacific Northwest Seismograph Network, Seattle, Washington
Mount St. Helens National Volcanic Monument - OUTSTANDING US Dept of Agriculture Forest Service site
Mount St. Helens VolcanoCam - Live photos from Mount St. Helens
Current Alerts for US Volcanoes - Cascade Range - USGS
Cascade Volcano Eruptions Locations and 4,000 year Eruption Summary - This is a gif we have used in class
Washington is home to five major composite volcanoes or stratovolcanoes (from north to south): Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, and Mount Adams. These volcanoes and Mount Hood to the south in Oregon are part of the Cascade Range, a volcanic arc that stretches from southwestern British Columbia to northern California. All Washington volcanoes except Mount Adams have erupted within the last 250 years. However, the volcanoes do not erupt at regular intervals, thus making it difficult to forecast when a given volcano might come to life again. Although worldwide the risks from volcanoes are significantly lower than risks from earthquakes and landslides, the relatively long recurrence interval for volcanic hazards (decades to several centuries) combined with their great potential for destruction make them particularly insidious. (See Mount Adams, Mount Baker, Glacier Peak, Mount Rainier, and Mount St. Helens below)
Volcanoes and History: Cascade Range Volcano Names - Where did Washington's volcanoes get their names?
America's Volcanic Past: Washington State - Many resources about Washington's volcanoes including: Potentially Active Volcanoes of the Western USA; Washington State: A Brief Geologic History
Monitoring Mount St. Helens Volcano - An Introduction - Volcano monitoring involves a variety of measurements and observations designed to detect changes at the surface of a volcano that reflect increasing pressure and stresses caused by the movement of magma, or molten rock, within or beneath it.
CVO Menu: Mount St. Helens, Washington - Main page for Mount St. Helens information from USGS/Cascades Volcano Observatory, Vancouver, Washington
NOAA Images - The Eruption of Mount Saint Helens - Slideshow of the 1980 eruption
Photo Glossary of Volcano Terms - A picture speaks a thousand words. Learn volcano terms with images and photos.
Eruptions of Mount St. Helens: Past, Present, and Future - Web-book written in 1984. Includes photos and information from USGS
Basic Fault Information: Fault Motion Animations - These animations are very elementary examples of fault motion intended for simple demonstrations. For more about faults see the NOAA slide show and information page - a rich source of images and textual information. from IRIS ( Incorporated Research Institutions for Seismology) is a university research consortium dedicated to exploring the Earth's interior through the collection and distribution of seismographic data. Support for IRIS comes from the National Science Foundation, other federal agencies, universities, and private foundations.
Advanced: NOAA/National Geophysical Data Center Images - Faults - More indepth information
Volcano World -- Premier Source of Volcano Info on the Web - Outstanding resource for kids interested in learning about volcanoes. Contains real-time volcano information including an interactive clickable map of active volcanoes worldwide and remote sensing satellite images. Volcano World Starting Points
Cascade Range Volcanoes - Miscellaneous Volcanic Facts, Questions, and Answers - Living with volcanoes -
Volcanoes -- Introduction - Can we predict how and when they will erupt? As population grows, more people are living in potentially dangerous volcanic areas. Mt. Rainier looms over the Seattle/Tacoma area, endangering a population of more than three million people...
Volcanoes Online - Your Ultimate Guide to Volcanoes - CyberSurfari entry designed to educate students about volcanoes; what it is, how they are formed, and how eruptions effect us all. Online games and multiple-choice quizzes. Interactive map of active volcanoes worldwide, lesson plans, etc. Outstanding resource for kids interested in learning about volcanoes. Interactive map of active volcanoes worldwide. How volcanoes work, submarine volcanoes, planetary volcanoes, etc., "kids' door", lesson plans and "Ask a Volcanologist" page.
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Currently Active World Volcanoes