DepthOffset Help


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Depth Offset Help

The DEPTH OFFSET pop-up window shows the depth offset value (in meters) which must be applied to the drilling depths (mbsf) in order to optimally align all cores from every hole at a given site. Each DEPTH OFFSET value refers to the depth increment which must be added to (or subtrated from) each core so that a composite spliced record can be constructed.

The DEPTH OFFSET values typically increase with increasing depth, reflecting the fact that they are cumulative depth corrections determined for each core.

The Percent Increase value reflects the percentage by which the Composite Depth Scale (mcd) has increased by relative to the Drilled Depth Scale (mbsf). Spliced composite records derived from pelagic deep-sea sediments are commonly ~8-10% longer than the raw drilling depths due to elastic rebound of sediments during core recovery and handling (see Moran et al., ODP Leg 154 Scientific Results Volume).

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updated: 30, April, 1996
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