Sea water hydraulic fluid system for an underground vibrator

Seismic apparatus

Seismic energy source

Seismic energy source

Seismic exploration method using a rotating eccentric weight sei

Seismic exploration system

Seismic exploration system for ice covered areas

Seismic exploration using compressional and shear waves simultan

Seismic exploration with a swinging-weight vibrator

Seismic explosive charge loader and anchor

Seismic land source

Seismic marine gun assembly

Seismic method for logging position of a deep borehole in the ea

Seismic methods having extended energy release

Seismic pneumatic energy source with flap valves for attenuation

Seismic pulse generator

Seismic pulse generator

Seismic shear wave vibrator with telescoping blade

Seismic signal generating apparatus

Seismic signal generator with a self-expanding vibrator support