ANNOUNCEMENTS

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ANNOUNCEMENTS

• Please read chapter 2 (the whole thing)
• Today
• a little more on the exercise we started in
  class. If you had an excused absence, you got a
  copy over email. If you were not excused, look
  on with a neighbor
• where earthquakes occur in different tectonic
  settings and why

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Turn on your clickers please
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What is the asthenosphere?

1. The rocky part of the upper mantle and the crust
2. The semi-molten (jello) part of the upper mantle
   and crust
3. The semi-molten part of the upper mantle, but no
   crust is involved
4. Just the crust, with no mantle involved

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Talk to your neighbor

• What answer did you give?
• How confident were you of that answer?
• Tell your neighbor one reason you gave that
  answer.
• What do you think of your neighbors reason for
  his/her answer -- makes more/less sense than
  yours?

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What is the asthenosphere?

1. The rocky part of the upper mantle and the crust
2. The semi-molten (jello) part of the upper mantle
   and crust
3. The semi-molten part of the upper mantle, but no
   crust is involved
4. Just the crust, with no mantle involved

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Take 5 minutes to complete the graph from
Fridays exercise

• even if you dont have your own copy, look on
  your neighbors and be sure you understand the
  questions that are on the sheet
• by the way, they are real earthquake data
• the sheet (w/ questions on the back) is due on
  Wednesday
• compare your graph with someone in your group --
  Im not into dot-for-dot correlation, Im into
  you seeing the general shape

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Divergent margin
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Your Clickers Please
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• What is the likely depth of
• earthquakes at mid-ocean
• ridges?
• very shallow or very deep, but probably nothing
  in between
• only very shallow
• only very deep
• any depth is possible and likely

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• What is the likely depth of
• earthquakes at mid-ocean
• ridges?
• very shallow or very deep, but probably nothing
  in between
• only very shallow
• only very deep
• any depth is possible and likely

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How to describe a fault

• Envision a house with a roof
• The line of the roof is the strike -- where two
  planes intersect
• The dip of the roof is the same on either side --
  its the angle of the roof

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