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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 欧美口爆视频 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.