Monopole-driven underwater sound source

Mounting and control means for full waveform seismic source

Mounting and control means for full waveform seismic source

Movable device for generating acoustic shear waves in the earth

Moving seismic source system for use in water-covered areas

Multi channel borehole seismic surveying tool

Multi-directional assemblies for sonic logging

Multi-function earthquake alerting apparatus

Multi-phase fluid flow measurement

Multiple chambered gas powered seismic source

Multiple-port, multiple-chamber, tuned air-powered subsea seismi

Multisensor ground-force measuring means for vibroseis

Multishot downhole explosive device as a seismic source

Near-surface seismic investigation source apparatus

No-flash seismic cord

Noise filtering method for seismic data

Noise-attenuating positioners for acoustic well-logging tools

Non-acoustic self noise canceller for sensor arrays

Non-explosive acoustic source

Nondestructive downhole seismic vibrator source and processes of