Use of refractor elevation models in the computation of refraction statics

5. Refraction Surveys

“…Baixas et al (1985) and Daly and Diggins (1988), for example, suggested that high-frequency variations in the base of the weathered layer could be indicative of an incorrect near-surface velocity. Redistribution subject to SEG license or copyright; see Terms of Use at http://library.seg.org/ an irregular refractor, a smooth depth profile and an irregular velocity profile, or an intermediate near-surface model-is an interpretive one.…”

“…Data from Michigan to illustrate refractor depth and near-surface velocity ambiguity: (a) delay time profile; (b) two possible near-surface models, A and B, which match the delay times and their associated datum static corrections; (c) common-midpoint stacked data with datum static corrections derived from models A and B (afterDaly and Diggins, 1988).129.78.139.28. Data from Michigan to illustrate refractor depth and near-surface velocity ambiguity: (a) delay time profile; (b) two possible near-surface models, A and B, which match the delay times and their associated datum static corrections; (c) common-midpoint stacked data with datum static corrections derived from models A and B (afterDaly and Diggins, 1988).129.78.139.28.…”