Difference between revisions of "Dictionary:ABC method"

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<center> <math> t_v = k t_w = \frac{ ( t_w V_1 ) } {(\sqrt{V_1^2 - V_2^2 })} </math>
 
<center> <math> t_v = k t_w = \frac{ ( t_w V_1 ) } {(\sqrt{V_1^2 - V_2^2 })} </math>
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File:Sega1.jpg|FIG. A-1. <b>ABC weathering method</b>. Weathering time ''t''<sub>''W''</sub> below ''B'' is ''t''<sub>''w''</sub>=(''t''<sub>''AB''</sub>+''t''<sub>''BC''</sub>&#x2013;''t''<sub>''AC''</sub>)/2 where ''t''<sub>''AB''</sub>=surface-to-surface time from ''A'' to ''B'' (obtained by adding the uphole time to the first-break time), etc.
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[[File:Sega1.jpg|thumb|center|450px|FIG. A-1. <b>ABC weathering method</b>. Weathering time ''t''<sub>''W''</sub> below ''B'' is ''t''<sub>''w''</sub>=(''t''<sub>''AB''</sub>+''t''<sub>''BC''</sub>&#x2013;''t''<sub>''AC''</sub>)/2 where ''t''<sub>''AB''</sub>=surface-to-surface time from ''A'' to ''B'' (obtained by adding the uphole time to the first-break time), etc.]]
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A method of computing refractor depth based on refracted arrivals from sources near the surface. Especially used for determinations of weathering thickness from sources above the base of the weathering. See Figure A-1. The weathering time tW is sometimes multiplied by a ‘‘k-factor’’ to give the vertical weathering time:


FIG. A-1. ABC weathering method. Weathering time tW below B is tw=(tAB+tBCtAC)/2 where tAB=surface-to-surface time from A to B (obtained by adding the uphole time to the first-break time), etc.