L19_SeismicRefractionII-page4

L19_SeismicRefractionII-page4 - Determining velocity, V 1 V...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Applied Geophysics – Refraction II Separation of delay times Determining the delay time beneath a geophone, T D : Total traveltime ABFG: ' 2 S S t T T V L T + + = Total traveltime ABCD: D S SD T T V x T + + = 2 Total traveltime GFED: D S D S T T V x L T + + = ' 2 ' Adding the equations for T SD and T S’D and using the equation for T t we obtain an equation for T D : 2 ' t D S SD D T T T T + = Î determine T D from a reversed refraction line p lu s Applied Geophysics – Refraction II Separation of delay times
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Determining velocity, V 1 V 2 : Direct arrival slope = 1/V 1 Subtracting the equations for T SD and T SD we obtain the equation: ' 2 2 ' 2 S S D S SD T T V L V x T T + = m i n u y = ax + b Plotting (T SD- T SD ) against x the slope is 2/V 2 Variations in the slope reflect lateral variations in velocity...
View Full Document

Ask a homework question - tutors are online