# 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>–''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. | + | [[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>–''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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## Latest revision as of 21:04, 5 June 2020

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 *t*_{W} is sometimes multiplied by a ‘‘*k*-factor’’ to give the vertical weathering time: