- Volcanoes are covered in Chapter 6 of your textbook. This chapter
concentrates on an appreciation of the volcanic problem, types of
volcanoes, volcanic hazards and eruption prediction. You will also
be reading from the United States Geological Survey's (USGS) "Volcano
Hazards" website. Please be aware that some of the terminology is
different between these two reading sources. Do not let this bother
you, sometimes geologists working in different areas use different
terms for the same process or material. The Volcanic Hazards Assessment
that you will do as a part of this lesson will use the USGS terminology.
When you take the end-of-lesson quiz, you should know both sets of
WORLD WIDE WEB READINGS:
- Volcanic Hazards: An introduction to volcanic hazards from the experts - the United States Geological Survey (USGS). You should read and learn about each of these featured hazards: tephra, lahars, lava flows, pyroclastic flows, landslides, and gases. This site has some of the best photos and illustrations that you will find on these subjects. This reading is very important because you will use it to complete one of your most challenging activities - the volcanic hazards assessment. You will need to know what these hazards are, what causes them, the types of
threats they present, and how to determine the areas at risk.
Monitoring Volcanoes: What do geologists watch for to determine when a volcano is likely to erupt? The USGS has an excellent record for predicting when volcanoes will erupt, the areas that will be affected, and how communities should respond to a volcanic threat. This site will explain how they use hydrology, ground deformation, seismicity, gas, and remote sensing to predict eruptions. You should read the introduction page for each of
Volcano World "Volcano World is the most comprehensive volcano site on the world wide web. It would take several days of continuous reading to see everything at this extensive site. Your visit
to this site now is only to see what is there. You may decide to use it when you are doing research to solve the
volcanic hazards assessment. The site has a search engine to locate the topics that you might need.
Mount St. Helens: A General Slide Set
"An album of USGS photos that document the 1980 eruption -
the most powerful in the recorded history of the 48 states!. This
site will give you a real appreciation of what the eruption effects
were like! The photos on this site are excellent and well worth the
trouble of clicking them up individually."
The photo at the top of this page was taken by T. J. Casadevall
of the United States Geologcial Survey and is part of a collection that
1980 eruption of Mount St. Helens.