Volcanic hazards: case histories, prediction of eruptions, and hazard maps

Lecture outline for environmental geology course


Some instructive case histories

Figure of Mt. St. Helens looking to the east and taken in 1996. The red arrow shows the northward direction of the lateral blast, while the Tuttle River valley is show with the lahar deposits in the foreground. This is the edge of the blast zone, and dead trees litter the slopes in the lower left corner.

 

Mt. St. Helens: the classic example for the U.S.. May 18th, 1980


Krakatoa (Krakatau): the big one. August 22nd, 1881, dormant for 200 years.


Mount Pelee - Martinique, West Indies, 1902


Nevado del Ruiz, Nov. 13 1985

Pinatubo, Phillipines - the video.

Dante's Peak was a movie!


Prediction of volcanic eruptions:

Possible precursors can monitor:

History of predictions:

Can an eruption be controlled or prevented?

So what's the concern? What specifically should be included in a hazard map for a volcanic region?

Image from USGS/CVO volcanic hazard program that nicely summarizes events and concerns possibly associated with an eruption.

Mitigation?


In class laboratory. Assessing Mount Hood.

Volcanos on the web. A lot of good case histories here.


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