Isopach

Isopach are maps that use isolines to connect points that have the same rock or sediment thickness. The term Isopach can be used interchangeably with isoline when the map is representing rock or sediment thickness.


The map shown is an Isopach Map showing the "Total Sediment Thickness of the World’s Oceans & Marginal Seas" in meters. The map connects the points of equal sediment thickness.. The lines are enhanced by different color shading. The darker the color (blues) the thinner the sediment; the light the color (reds) the thicker the sediment.


http://www.ngdc.noaa.gov/mgg/sedthick/sedthick.html