FIELD: physics.
SUBSTANCE: method involves moving a device through an underground formation from a first depth to subsequent depths. The device receives a seismic signal during given time slots. The seismic signal is generated by a seismic source which is excited at variable moments in time relative to the given time slots based on the depth of the device.
EFFECT: high accuracy and information value of probing data.
20 cl, 7 dwg
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