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Geology 101 Homework 2
Quiz on this material will be Thursday, March 13
Show me completed work for credit on or before Thursday, March 20
Write your answers on a separate piece of paper.
Interlude C, pages 318-329
1) Explain the evidence for the theory that the outer core of Earth is liquid.
2) Explain the factors that affect the speed of a seismic wave as it travels through the
Earth.
Chap. 11
1) What is the difference between stress and strain?
2) What is the difference between ductile and brittle behavior for rocks?
3) There are two important brittle-ductile transitions in the upper 600 km of the Earth. In
what layers or between which layers are they located?
4) Draw pictures of normal, reverse, and strike-slip faults using arrows to show motion
along the faults and naming the type of stress that causes these faults.
5) How do continents grow?
6) What causes mountain ranges to rise? What causes mountain ranges to lose elevation
over time?
7) How is the achievement of isostatic equilibrium related to the properties of the
asthenosphere?
Chap. 10
1) Discuss how seismologists identify recurrence intervals for earthquakes and how that
knowledge can be applied to assess risk.
2) How are earthquake epicenters located?
3) What is the difference between the Mercalli intensity scale, the Richter scale, and the
seismic moment scales for measuring earthquakes?
4) What is the difference between a Richter magnitude 8 and a Richter magnitude 7
earthquake?
5) What is the evidence for subduction? How does it relate to our concepts of
asthenosphere and lithosphere?
Interlude C
Travel time
Reflection
Refraction
Moho
P-wave shadow zone
S-wave shadow zone
Seismic tomography
Chap. 11
Orogeny
Anticline, syncline
Brittle, ductile
Detachment fault
Craton and shield
Isostatic equilibrium
Fault vs. joint
Stress vs. strain
Normal fault, reverse fault,
strike-slip fault
Tensional, compressional,
and shear stress
Chap. 10
Aftershock, foreshock
Body waves (p-waves, swaves)
Surface waves
Fault scarp
Intraplate earthquakes
Liquefaction, resonance
Tsunami
Seismic gaps
Recurrence interval
Wadati-Benioff zone