On top is the migrated reflectivity section, derived directly from the data by Kirchhoff summation through the laterally variant optimized velocity model. Following the work of Harlan and Claerbout, we perform an identical migration to yield the next image down, but after scrambling the shot records by sign-reversing about every other trace. For the focusing image, the next one down, we statistically compare the amplitude histograms of the two images above using Harlan's signal expectation measure. Some of the basin stratigraphy, basin bottom, and an unknown structure within the hanging-wall bedrock remain. The original migration, without statistical enhancement, we interpret to show likely features and artifacts at two times vertical exaggeration.
Lowest elevation is about sea level.
Dip of the deeper section of the fault may well be less than 20 degrees. Listric normal faults entirely within clastic delta sediments have long been imaged by the petroleum industry. Having the correct fault geometry was crucial to proving the listric nature of this fault. Next Page Presented by invitation to the Geophysics Section of Science Wellington , New Zealand, on September 17 1998.