Isopach lines are contour lines that connect areas of equal ground thickness. The image above works to show the thickness of ash that has piled up after the eruption of El Chichon. The legend shows us that this occurred in the south of Mexico. These types of maps are especially important for people looking to do any type of drilling or digging. Say a person was looking to drill for oil. If they had an isopach map, they could know ahead of time how far down they would have to dig in order to reach the oil. By looking at the image, we can see that the ash is piled up in much of a "cone" shape. The small circle at the top slowly gets larger and larger as we go out, with the level of thickness getting thinner and thinner.
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