Announcements

• Exam Weds. March 7, review March 5, here, 5 PM

• All of the classwork that hasn’t 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.

Today

• Video on volcanic hazards

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

A wee review…

What is this feature?

1. Pyroclastic flow on a stratovolcano

2. Talus deposit occurring on a dome

3. Maar eruption4. Lava flow

This could be many things, but based on the landforms, what is most likely? The

volcano is Mount St. Helens.

1. Ash-flow tuff

2. Lava flow

3. Debris-avalanche deposit

4. Pumice fall

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.

Exercise to understand volcanic hazards

• Groups of 4-5 please…

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 again…but use your knowledge of the lifespan of your volcano type

• 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 don’t have enough information! but use common sense. You may use the computers in the lab also.