Exciting method for logging by S wave

摘要: An exciting method for a logging by means of S wave is provided which includes inserting source into bore hole containing water and actuating an operating mechanism in the to impart force wall direction perpendicular axis hole, so as generate having characteristics predominant radiation force. The improvement invention comprises abruptly ejecting at one side intersecting extension force, while, simultaneously opposite source, sucking equivalent volume that ejected first mentioned side, whereby positive negative pressure change are indirectly applied through medium two respective sides axis.