Changes

==Edges==

==Edges==

[[file:interpreting-seismic-data_fig12-2.png|thumb|{{figure number|2}}. Copyright: Liner, 1999; courtesy PennWell.]]

[[file:interpreting-seismic-data_fig12-2.png|300px|thumb|{{figure number|2}}. Copyright: Liner, 1999; courtesy PennWell.]]

If you look at a rock outcrop, you see [[sandstone]], [[shale]], [[limestone]], etc. If you look at seismic data, you see the edges of rock units. The figure below shows the edge effect on a Gulf of Mexico [[salt dome]] example. Seismic analysis is, in effect, an edge detection technique. The bigger the [[velocity]] and/or [[density]] contrast between the rocks, the stronger the edge.

If you look at a rock outcrop, you see [[sandstone]], [[shale]], [[limestone]], etc. If you look at seismic data, you see the edges of rock units. The figure below shows the edge effect on a Gulf of Mexico [[salt dome]] example. Seismic analysis is, in effect, an edge detection technique. The bigger the [[velocity]] and/or [[density]] contrast between the rocks, the stronger the edge.