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The Geophysics Ph. D. Program was approved by the  in 1973 as an interdepartmental degree program under the Graduate School of the University of ÃÛÌÇÖ±²¥ at Boulder. The initial emphasis of the program was on Solid-earth Geophysics. In January 1993, the Graduate School approved the addition of an option in under the program, as the graduate-level course requirements for the two subfields of geophysics are different.