Visit Your Local PBS Station PBS Home PBS Home Programs A-Z TV Schedules Watch Video Donate Shop PBS Search PBS
NOVA Home Find out what's coming up on air Listing of previous NOVA Web sites NOVA's history Subscribe to the NOVA bulletin Lesson plans and more for teachers NOVA RSS feeds Tell us what you think Program transcripts Buy NOVA videos or DVDs Watch NOVA programs online Answers to frequently asked questions
Volcano's Deadly Warning

Seismic Signals
by Rick Groleau

 

Volcano's Deadly Warning homepage

There are earthquakes and then there are earthquakes specific to volcanoes. In recent years, scientists have learned a great deal about the quakes volcanoes generate, thanks in no small measure to the work of engineer-turned-seismologist Bernard Chouet. Some volcano quakes originate in solid rock and some in molten rock that is trying to move through underground channels. It is the latter type of earthquake that helped Chouet forecast the eruption of Mt. Redoubt in Alaska and that shows promise in predicting future eruptions.

  • Seismic Signals (128K)
    See the differences between the various types of earthquakes that originate within volcanoes and decipher the squiggly lines they produce. Requires Flash. Non-Flash version

Seismic Signals

Seismic Signals (128k)
Requires Flash 5


Flash is a plug-in that allows for increased interactivity. If you can see the animated boxes at left, the plugin is already installed. If you do not see the boxes, you can install the Flash plugin, or select this feature's non-Flash version.



Sources
Chouet, Bernard A. "Long-period volcano seismicity: its source and use in eruption forecasting." Nature, March 28, 1996.

Manual of Seismological Observatory Practice.
http://www.seismo.com/ msop/msop_intro.html


Rick Groleau is managing editor of NOVA online.


Send feedback Image credits
   
NOVA Home Find out what's coming up on air Listing of previous NOVA Web sites NOVA's history Subscribe to the NOVA bulletin Lesson plans and more for teachers NOVA RSS feeds Tell us what you think Program transcripts Buy NOVA videos or DVDs Watch NOVA programs online Answers to frequently asked questions

Support provided by

For new content
visit the redesigned
NOVA site