High amplitude sound wave generator
High frequency gas detonator
High frequency reaction mass and hydraulic cylinder assembly
High pressure sealing apparatus
High speed seismic gas exploder and method of operation
Horizontally polarized shear-wave vibrator seismic source
Human-portable geophysical energy source
Hydraulic release system for use in a borehole apparatus
Hydraulic slotted cylinder source
Hydraulic stabilization system to position and isolate a seismic
Hydraulic synchronizing system for coordinating movement of the
Hydraulic vibrator
Hydraulically-actuated downhole seismic source
Hydraulically-coupled, land seismic signal source
Hydrogen-oxygen acoustic logging device