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In page Walter Munk:

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In 1946, the United States tested two fission nuclear weapons (20 kilotons) at Bikini Atoll in the equatorial Pacific in Operation Crossroads. Munk helped to determine the currents, diffusion, and water exchanges affecting the radiation contamination from the second test, code-named Baker.[1][2] Six years later he returned to the equatorial Pacific for the 1952 test of the first fusion nuclear weapon (10 megatons) at Eniwetok Atoll, code-named Ivy Mike.[3]:25 Roger Revelle, John Isaacs, and Munk had initiated a program for monitoring for the possibility of a large tsunami generated from the test.[3]:26