Announcements

1
Announcements

• Exam Weds. March 7, review March 5, here, 5 PM
• All of the classwork that hasnt been picked up
  has been moved. Left-over Pinatubo video
  worksheets are on the table, unclaimed other
  things are in the lowest right-hand box.

2
Today

• Video on volcanic hazards
• Exercise on what makes a volcano likely (or not)
  to pose a significant hazard?

3
A wee review
4
What is this feature?

• Pyroclastic flow on a stratovolcano
• Talus deposit occurring on a dome
• Maar eruption
• Lava flow

5
This could be many things, but based on the
landforms, what is most likely? The volcano is
Mount St. Helens.

• Ash-flow tuff
• Lava flow
• Debris-avalanche deposit
• Pumice fall

6
The video (Understanding Volcanic Hazards)

• Seven kinds of hazards are discussed
• Your job is to understand what kinds of hazards
  are more likely at what kinds of volcanoes.
  Specifically for this video, you need to (alone
  or with a friend) choose the most and least
  dangerous hazard and be able (on an exam, for
  example) state why you chose those.

7
Exercise to understand volcanic hazards

• Groups of 4-5 please

8

• You have seen/heard about several kinds of
  volcanoes and several kinds of hazards
• You have/will get some information about a
  specific volcano.
• shield volcano
• stratovolcano
• dome
• If you have any sense of geography, that is very
  helpful!!
• ALWAYS assume that if it happened before, it can
  happen againbut use your knowledge of the
  lifespan of your volcano type

9

• You will need to put together a reasonable
  scenario for these things (have one person for
  each)
• the type of hazard likely from your volcano
• other hazards likely to occur at the same time
• the chances that the hazard will produce a
  disaster, given who lives where with respect to
  the volcano
• an assessment of why people are living near the
  volcano
• what are ALL the controls on the kind of volcano
  having the hazards it does
• ASK if you feel you dont have enough
  information! but use common sense. You may use
  the computers in the lab also.