Apparatus for detecting geophysical energy

Apparatus for generating multiple seismic signals in a wellbore

Apparatus for generating P waves and S waves

Apparatus for generating seismic vibration energy in a borehole

Apparatus for generating seismic waves

Apparatus for generating seismic waves

Apparatus for generating seismic waves

Apparatus for generating vibrational energy in a borehole

Apparatus for generating waves in the ground

Apparatus for imparting seismic signals into the earth

Apparatus for marine shear wave prospecting

Apparatus for pack-off locking of seismic energy source

Apparatus for placing geophones beneath the surface of the earth

Apparatus for removal of condensation from a marine gas exploder

Apparatus for the acquisition of a seismic signal transmitted by

Apparatus for the generation of acoustic signals in marine envir

Apparatus for the production of seismic shocks

Apparatus for timing the firing of energy sources

Apparatus for wires in the ground

Apparatus having push/pull actuated boom for generating waves in