Underground acoustic wave transmitter, receiver, transmitting/receiving method, and underground exploration using this

An underground acoustic wave transmitting method for transmitting an acoustic wave in ground, characterized by arranging an underground acoustic wave transmitting device (30) in a bore hole (12) to transmit an acoustic wave in ground, said transmitting device (30) including at least first and second source vibrators (32), with each said source vibrator (32) comprising:

• a mass body (40) arranged in an axial direction of said bore hole;
• a vibrator (34) disposed on said mass body such that the vibration direction is perpendicular to or parallel with a wall of said bore hole;
• an anvil (42) for contacting to said wall, disposed on a bore hole wall side of said vibrator;
• and
• a claiming mechanism (64) for pressure-contacting said anvil to said wall of said bore hole;
• wherein said first and second source vibrators (32) are substantially aligned with one another in said bore hole, with said first source vibrator (32) having a rotational position substantially 90° from a rotational position of said second source vibrator (32).

An underground exploration method characterized by arranging an underground acoustic wave transmitting device (30) in a bore hole (12) to transmit an acoustic wave in ground, said transmitting device (30) including at least first and second source vibrators (32), with each said source vibrator (32) comprising:

• a mass body (40) arranged in an axial direction of said bore hole;
• a vibrator (34) disposed on said mass body such that the vibration direction is perpendicular to or parallel with a wall of said bore hole;
• an anvil (42) for contacting to said wall, disposed on a bore hole wall side of said vibrator;
• and
• a clamping mechanism (64) for pressure-contacting said anvil to said wall of said bore hole;
• wherein said first and second source vibrators (32) are substantially aligned with one another in said bore hole, with said first source vibrator (32) having a rotational position substantially 90° from a rotational position of said second source vibrator (32).

An underground acoustic wave emitting and receiving method characterized by arranging an underground acoustic wave transmitting device (30) in a bore hole (12) to transmit an acoustic wave in ground, said transmitting device (30) including at least first and second source vibrators (32), with each said source vibrator (32) comprising:

• a mass body (40) arranged in an axial direction of said bore hole;
• a vibrator (34) disposed on said mass body such that the vibration direction is perpendicular to or parallel with a wall of said bore hole;
• an anvil (42) for contacting to said wall, disposed on said bore hole wall side of said vibrator;
• and
• a clamping mechanism (64) for pressure-contacting said anvil to said wall of said bore hole, and
• by arranging an underground acoustic wave receiving device in another bore hole (112) to receive an underground acoustic wave, said receiving device comprising:
• a packer (182) for closing a bottom portion of said another bore hole (112);
• a shut-off valve (180) for closing a ground outlet of said another bore hole (112);
• a clamping mechanism (164) for fixing a cable (150), arranged above a vibration receiver in said another bore hole, to a wall of said another bore hole so as to decrease tension of said cable arranged above said vibration receiver and then relax said cable;
• wherein said first and second source vibrators (32) are substantially aligned with one another in said bore hole, with said first source vibrator (32) having a rotational position substantially 90° from a rotational position of said second source vibrator (32).

An underground exploration method characterized by arranging an underground acoustic wave transmitting device (30) in a bore hole (12) to emit an acoustic wave in ground, said transmitting device (30) including at least first and second source vibrators (32), with each said source vibrator (32) comprising:

• a mass body (40) arranged in an axial direction of said bore hole;
• vibrator (34) disposed on said mass body such that the vibration direction is perpendicular to or parallel with a wall of said bore hole;
• an anvil (42) for contacting to said wall, disposed on a bore hole wall side of said vibrator;
• and
• a clamping mechanism (64) for pressure-contacting said anvil to said wall of said bore hole, and
• by arranging an underground acoustic wave receiving device in another bore hole (112) to receive an underground acoustic wave, said receiving device comprising:
• a packer (182) for closing a bottom portion of said another bore hole (112);
• a shut-off valve (180) for closing a ground outlet of said another bore hole (112);
• a clamping mechanism (164) for fixing a cable (150), arranged above a vibration receiver in said another bore hole, to a wall of said another bore hole so as to decrease tension of said cable arranged above said vibration receiver and then relax said cable;
• wherein said first and second source vibrators (32) are substantially aligned with one another in said bore hole, with said first source vibrator (32) having a rotational position substantially 90° from a rotational position of said second source vibrator (32).