Environmental Geophysics Lect.7, Crosshole Seismic survey and seismic Tomography

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Environmental Geophysics Lect.7, Crosshole Seismic survey and seismic Tomography
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Assalamalaikum sir
Can I know what should be the distance between source borehole and receiver borehole in case of seismic tomograph?
I have read in ASTM code for cross hole test. The code mentions the maximum distance between the boreholes as 3m.

nehanasreen