To generate a custom animation of changing isosurfaces, click first on the desired starting density and then ending density in the color legend of the image above.
The isosurface consists of all voxels that are equal to the density selected. This creates a continuous shell which is the 3-D equivalent of a 2-D contour line. Because almost no sediment has a density less than that of water, isosurfaces generated at densities less than 1.0 encompass the entire volume (and make a rather dull animation!).
Only the outermost isosurface shell will be visible. For details of the internal structure of the volume, see the volume animations. For scientific details of how the Brashear volume data were obtained and processed, see the Brashear Island Volumetric Interpolation page.
For an interactive interface to the Brashear volume data which allows the retrieval of single isosurfaces, see the Virtual Brashear - Pick an Isosurface.