Title : 
Geophysical Techniques for Studying the Earth´s Interior
         
        
            Author : 
Sutton, George H.
         
        
            Author_Institution : 
Lamont Geological Observatory, Columbia University, Palisades, New York. Contribution No. 1570
         
        
        
        
        
        
        
            Abstract : 
A great variety of instruments are being used to measure geophysical parameters. Many of these parameters exhibit extremely small variations about a large average value. Since it is often the small variations that are of interest to the geophysicist, these instruments usually must be extremely sensitive and stable.
         
        
            Keywords : 
Acoustic waves; Earth; Geology; Geophysical measurements; Instruments; Magnetostriction; Navigation; Observatories; Oceans; Sea surface;
         
        
        
            Journal_Title : 
Proceedings of the IRE
         
        
        
        
        
            DOI : 
10.1109/JRPROC.1962.288331