An Isopach is an isoline or contour that connects equal points of thickness of a geological stratum formation, such as rock. The accompanying map uses isopachs to describe the thickness of ashfall from the Cerro Negro volcano in Nicaragua in 1995. Isopachs within the 5.0 cm limit are at 10-cm intervals, and up to 50 cm closest to the crater. For comparison the 2-5 June isopachs are shown.
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