As the characteristics of shear-waves became better known, the need for sources and detectors was clear. This led to the invention of a dipole logging tool. This provided a companion to the monopole. There seemed to be no commercial market at that time for the dipole tool, and it was some years before a tool was built that would operate under the severe conditions encountered in oil wells. Mathematical analysis continued leading to such a variety of vibrational modes that it was dubbed “the Hula log.” With the source and detector mounted in the same logging tool, the waves are strongest near the borehole. Each combination of source type and detector type gives different information.
Figures & Tables
Seismic Wave Propagation: Collected Works of J. E. White
This first chapter sets the stage for the later technical development of Dr. Whit’s career in applied seismics. Experiments, f’wst at the Acoustics Laboratory of the Massachusetts Institute of Technology and later at Mobil Oil and Marathon Oil, provided insight into the general problems of impedance measurements, transduction, filtering, and attenuation. These papers also serve as a bridge to show geophysicists how theft own experiments in seismology naturally interface with (indeed, arose out of) the larger world of sound measurements in air and water. These experiments demonstrate the power of geometrically constrained experiments to allow verification of approximate (and in some cases, exact) theories of sound.