In the following two articles β€” part of a series of Geophysics articles published in 2005 to mark the 75th anniversary of SEG β€” Enders Robinson and Sven Trietel revisit the early development of digital signal processing (DSP) in the Geophysical Analysis Group (GAG) at Massachusetts Institute of Technology.

In β€œThe MIT Geophysical Analysis Group (GAG) from Inception to 1954,” Robinson describes the history of GAG, which originated in 1950 and was supported by oil and geophysical companies. In 1954, GAG showed that analog seismic processing (frequency filtering and mixing) could be replaced by digital signal processing with deconvolution,...

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