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ANNOUNCEMENTS
• First hour exam Wednesday 2/7; review
session Monday 2/5 5.00 - 6.00, here
• Happy Groundhog’s Day, also
Candlemas, and various other names.
ANNOUNCEMENTS
• I STILL need PINs from: Boykin, Buchanan,
Civetta, Clausen, Dickason, Duvick,
Escalante, Fix, Gonzalez, Hunt, Hurst,
Jimerfield, Jones, Krupoff, Magaldi, Mayon,
Meehan, Moehr, Nelson, Rawls, Sillin, Slade,
Watson
• Email me your PIN please (painless, and lets
you take the exam, and so pass the class)
TODAY
• Terminology of earthquakes
– focus
you know these
– epicenter
– fault trace (= strike line)
– fault plane (has a strike and a dip)
– magnitude
– intensity
• The video
Since I know everyone totally gets it
now…
Clickers please…
What kind of fault movement warped this row of
young corn?
1.
2.
3.
4.
left-lateral strike-slip movement
right-lateral strike-slip movement
normal dip-slip movement
reverse dip-slip movement
Guatemala, 1976
The other two terms
• Magnitude: how big
• Intensity: how damaging
From, Science
Made Stupid
The video…
• is a bit sappy, but has great information, so
pay attention to
– the different hazards discussed
– the concept of seismic gap, and
– earthquake prediction
• complete the worksheet
EVERYTHING in class (including a video, hint,
hint) is fair game for the exam
Clickers please…(wake up)
A seismic gap that exists near San
Francisco suggests that
1. an earthquake is likely to occur there in the
near/intermediate future
2. the stress in the Earth’s crust has been
relieved by large and small earthquakes,
leaving a gap in the zone of most danger.
3. scientists are able to image where the
tectonic plates are in contact, and there is a
gap between them
4. after a certain amount of time, movement
on the San Andreas Fault may become left
lateral
If you had a second-most likely choice, please vote again
A seismic gap that exists near San
Francisco suggests that
1.
2.
3.
4.
An earthquake is likely to occur there in the
near/intermediate future
The stress in the Earth’s crust has been relieved by
large and small earthquakes, leaving a gap in the
zone of most danger.
Scientists are able to image where the tectonic
plates are in contact, and there is a gap between
them
After a certain amount of time, movement on the
San Andreas Fault may become left lateral
An earthquake with M6.2 occurred about
50 km from this area. If there were
building all along this profile, where did
the most damage probably occur?
A
B
Need a hammer to break
either of these
C
D
Pieces of
other rocks,
somewhat
consolidated