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Plus Minus Method
The plus-minus method, also known as CRM (conventional reciprocal method), is a geophysical method to analyze seismic refraction data developed by J. G. Hagedoorn. It can be used to calculate the depth and velocity variations of an undulating layer boundary for slope angles less than ~10°. Theory In the plus-minus method, the near surface is modeled as a layer above a halfspace where both the layer and the halfspace are allowed to have varying velocities. The method is based on the analysis of the so-called 'plus time' t^+ and 'minus time' t^- that are given by: : t^+ = t_ + t_ - t_ : t^- = t_ - t_ - t_ where t_ is the traveltime from A to B, t_ the traveltime from A to X and t_ the traveltime from B to X. Assuming that the layer boundary is planar between A'' and B'' and that the dip is small (<10°), the plus time corresponds to the intercept time in classic refraction analysis and the minus time can be expressed as: [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sketch Of Plus-minus-method
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