It is rather hard for me to believe but the inception of exploration geophysics took place less than a century ago. Furthermore, adapting seismology to resource exploration really didn't get started until the 1920s when J. Clarence Karcher in the United States and Ludger Mintrop in Germany began commercializing some of the knowledge they had picked up in World War I when both sides used “sound ranging” to locate enemy artillery. Success came quickly, and geophysics was soon leading the way into unexplored frontiers. In 1933 Karcher tabulated that between 1924 and 1929 his company alone had identified 44 salt...

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