# Practice Problems¶

### Lecture 22¶

Answer each number in a separate cell

Rename the notebook with your lastName and the lecture

ex. CychB_22



Turn this notebook into triton-ed by the end of class

# 1. Great circles¶

• Someone measured the strike and dip of a plane to be 333 and 42$^{\circ}$ NE.
• Calculate the dip direction and the pole to the plane from the strike and dip.
• Plot the trace of the plane on an equal area net.

[Hint: look at Lecture 21 for how strike and dip works.]

# 2. Small circles¶

• Someone measured a bunch of geomagnetic directions with a mean inclination of 33 $^{\circ}$ declination of 12$^{\circ}$ and a circle of 95% confidence of 15$^{\circ}$.

• Plot the mean direction as a solid red triangle in an equal area diagram

• Plot the circle of confidence as blue dots
• Calculate the antipode of the mean direction (the direction 180$^{\circ}$ away with the opposite inclination).
• Plot the antipode as a white triangle with a black edge.
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