An isopach is a contour that connects points of equal thickness. One of the most common places to find this tpe of feature is on a map of where ash lands from a volcano. The map above exhibits that exact scenario.
>Source: http://www.geo.utexas.edu/faculty/barker/kempter/rbtephra.gif
>Source: http://www.geo.utexas.edu/faculty/barker/kempter/rbtephra.gif
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