PHYS/GEOL 406 Homework
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   Homework #7: Do not turn this in since there is a test on Friday, March 20. I will post my solutions.

Reading:

  • section 4.3.1. The book does the derivation that I set up in this section. However, the bottom lines involved Eqs. (4.31) and (4.32). Those fit in the overall equation that I gave you for the dipping hyperbola. I've found that version to be more useful/intuitive than (4.26) or (4.27) in our book. But you're welcome to use either...so long as you get the right answer.
  • ********** end of seismic **********
  • sections 5.1 and 5.2
  • sections 5.3.1-5.3.3. Note Figures 5.6 and 5.8 with the current and equipotential lines.
  • section 5.10 talks about resistivity surveying in general. Good reading.
Assignment:
  1. problem 4.6. And by "interpret..." they mean to get the speed of the material above the reflection interface, the dip angle, the perpendicular distance (shortest distance) to the reflection interface, and explain how you know whether the shallower side of the interface is towards the positive-x or the negative-x axis.
  2. Make a graph (either spreadsheet, or very neat hand drawing) of the raw reflection data in problem 4.8 and interpret this data as in the problem above.
  3. ********** end of seismic ********** The test on Friday, March 20 will only include seismic material, not the resistivity material that we started this week.
  4. problem 5.1. And by "potential difference" they mean VP2-VP1. Show your work here, and use basic geometry to get the distances between the source electrodes ("C" for "current" on the surface) and the potential points ("P" in the subsurface).

That's all for homework #7.