Isopach maps are maps in which depict rock and sediment thickness recordings. They do this by illustrating thickness variations within a tabular unit, stratum, or layer and in this case, features and sediments on the earth's surface. More simply, isopachs can be thought of as contour lines connecting areas of equal thickness. The above map is a isopach map of the Hekla 4 eruption. The contour lines shown give thickness of tephra in centimeters(see legend at the right). Using this information, we can see that most of the tephra was blown to the north of the eruption and over half the country received more than one cm thick of ashfall.
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