Plunge measures the degree to which a feature deviates from the horizontal. In the case of the folds I drew, they slant downwards at the surface. They would have no plunge if they were perfectly horizontal. Imagine a horizontal plane at the top of the fold, and measure the angle at which it dips downwards from there. A greater plunge thus corresponds to a steeper fold.
What's the measure of plunge supposed to represent, though? I can't really understand this concept from anywhere else.
Plunge measures the degree to which a feature deviates from the horizontal. In the case of the folds I drew, they slant downwards at the surface. They would have no plunge if they were perfectly horizontal. Imagine a horizontal plane at the top of the fold, and measure the angle at which it dips downwards from there. A greater plunge thus corresponds to a steeper fold.
@@geologic7656 That mostly makes sense. So the plunge is the angle between a horizontal plane and the cave-like structure you drew?
Thanks