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Visualization of how a stereonet (Schmidt, equal-area net) relates to the corresponding lower hemisphere, how a plane relates to its pole, and how planes and poles are represented in a stereonet, using a physical model (clear acrylic hemisphere).
This video employs what I refer to as the “American right-arm rule” for strike and dip of planes; looking to the strike direction, the plane dips in the direction of the observer’s right arm. This is very different from the traditional “British right-hand rule”.
This video was produced during the fall of 2020, at the heart of COVID, as part of my effort to teach structural geology online.