Method and apparatus for measuring seismic energy imparted...

Method and apparatus for reducing the stretch of an elastomeric

Method and apparatus for sensing when a seismic gas exploder is

Method and apparatus for the production of seismic shocks

Method and system for generating shear waves and compression wav

Method and system for well velocity shooting and vertical seismi

Method for generating seismic shearing waves in a subterranean f

Method for improving the efficiency of air guns

Method for reshaping acoustical pressure pulses

Method of and apparatus for generating shear seismic waves

Method of generating a seismic signal employing a water piston

Method of seismic evaluation of subterranean strata

Methods and apparatus for the generation and transmission of sei

Methods and apparatus for use in generating and transmitting aco

Methods of and apparatus for generating seismic waves

Mixed device for generating longitudinal or shear waves

Mobil device for generating acoustic shear waves in the earth

Mobile device for generating acoustic shear waves

Mobile high frequency vibrator system

Mobile seismic energy source