Prompts follow: 1. enter file name. Example: 1001.seg hardwired as a 6 channel shot record with 3 components down-hole and 3 components stationary reference phone at the surface. Down-hole Phone ch1=Vert ch2=Radial ch3=Transverse Reference Phone ch4=V ch5=R ch6=T 2. GUI, informative. 3. GUI, choose either the down-hole or surface reference phone. 4. GUI, choose component for X-axis, say T 5. GUI, choose component for Y-axis, say R 6. GUI, choose a scale factor, or default 7. GUI, choose a Tmax, say .05 seconds 8. GUI, click continue 9. GUI, choose the next Tmax, say 0.10 seconds 10. GUI, click continue KEY POINTS: * There will always be a sign convention. Here, on the vertical phone, upward velocity produces a negative voltage. Do a tap test for your equipment. * The hodoplot.m program is hard wired to relate components to the GUI choices. If your phones use different channels for V, R, T, then you may need to modify the code. By the way, R and T are just arbitrary labels considering that down-hole phones will twist there orientation as they travel up or down the hole.
What you are doing is progressively working down in time, plotting the particle motion. With each step, just change the Tmax value, the Tmin value is automatically adjusted to the last step tmax value. Here the first arrival largest motion is in the direction of the R component. This means that it is mostly aligned with the source blow to the West. The T component is oriented mostly orthogonal to the source.
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