http://www.geo.utexas.edu/faculty/barker/kempter/rbtephra.html
An isopach map illustrates thickness variations within rock layers or stratum. Isopachs are contour lines that represent equal thickness over an area. Isopach maps are utilized in hydrographic survey, stratigraphy, sedimentology, structural geology, petroleum geology and volcanology. Isopach maps can help protect lives as well as save money when used in certain geologic fields. The image shown above shows the value of having an isopach map. This isopach map shows the dispersal of ash that could be potentially harmful to those living nearby the estimated area.
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