Theoretical seismograms for fundamental mode Rayleigh waves were calculated for atmospheric point sources over oceanic and over continental earth models, as recorded at an epicentral distance of 10,000 km. Yields were uniformly distributed over the range 1 kT to 10 MT, for source altitudes in the range 0.3 to 92.0 km. The earth structures used were thoäse of Gutenberg and of Anderson and Tokso2. The source models were point mass-injection and energyinjection sources at altitude, as well as a distributed pressure pulse at the surface of the earth.