ANNOUNCEMENTS

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ANNOUNCEMENTS

• First hour exam Wednesday 2/7 review session
  here, this evening, 2/5, 5.00 - 6.00, bring your
  questions
• Please pick up your homework on the table by the
  door
• When you send me an email (extra credit or
  otherwise) PLEASE be sure to let me know who you
  are!!

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ANNOUNCEMENTS

• I STILL need PINs from Boykin, Civetta,
  Dickason, Duvick, Escalante, Fix, Gonzalez, Huey,
  Hunt, Hurst, Jones, Krupoff, Magaldi, Mayon,
  Nelson, Rawls, Sillin, Slade, Watson
• Email me your PIN before the exam please

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TODAY

• Some review (clickers, of course!)
• The earthquake cycle (elastic rebound)
• The relation between depth and intensity

4

• Clickers please

5

• Who won the Super Bowl?
• Chicago
• Indianapolis
• Who cares???

6
On Dec. 26, 2004, a M 9.2 earthquake hit Sumatra,
causing a devastating tsunami that killed
thousands of people. What was the magnitude here
in Flagstaff?

1. 0, no one felt it or knew about it until some
   hours later
2. 3 - 4 -- an earthquake that big wasnt so huge in
   Flag, but was still there
3. 9.2 -- magnitude doesnt change from place to
   place

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On Dec. 26, 2004, a M 9.2 earthquake hit Sumatra,
causing a devastating tsunami that killed
thousands of people. What was the intensity here
in Flagstaff?

1. 0, no one felt it or knew about it until some
   hours later
2. III - IV -- an earthquake that big wasnt so huge
   in Flag, but was still there
3. IX -- intensity doesnt change from place to place

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If you got either of the last two wrong was
because

1. You werent here last time and so missed the
   discussion of magnitude and intensity
2. You were here, but were daydreaming
3. You were here, but youd appreciate hearing it
   again

9
Liquefaction

1. Isnt likely to occur here in Flagstaff
2. Happens when water and mud are shaken loose from
   each other
3. Can cause sand volcanoes
4. All of these are correct

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A seismic gap that exists near San Francisco
suggests that

1. theres a gap in the danger zone along the fault
   near San Francisco because of the 1989 quake and
   all the aftershocks
2. a seismic gap suggest that no movement has
   occurred on the fault, and so seismologists think
   the motion on the fault could change to much more
   dip-slip than strike-slip
3. a type of imagery called seismic tomography lets
   scientists see where physical gaps between plates
   are, and theres one near San Francisco
4. an earthquake is more likely to occur there in
   the near/intermediate future than around Loma
   Prieta, where the focus of the 1989 earthquake was

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(No Transcript)
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What is happening to the Nazca Plate beneath the
Andes? -- what is its depth?

1. 50 - 350 km
2. 0 - 700 km
3. 75 - 200 km
4. theres no way to tell

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(Enough clickers for the moment)
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These are layers of rock
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The earthquake cycle, usually called elastic
rebound
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Exam reminders

• BRING a 2 pencil (for multiple-choice part)
• Please be ready to take your baseball cap off or
  turn it around
• PLEASE be on time. The door will be
  closed/locked at 11.45 so that people arent
  distracted by folks coming in/out. Use the
  bathroom before you start the mid-term.
• Please dont ask for extra time. The exam ends at
  12.20.
• Cell phones out and on the desk, closed too!

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Exam reminders

• A lot of people find that the easiest way to do
  multiple choice is to cover the answers, and
  scribble a note down with the correct answer next
  to the question, and then see which answer is the
  closest