Shear waves (S-waves) created by an explosion at or near an interface have been observed in experimental field studies and in mathematical model studies, but the observations have been separated so widely in time, place, and publication that their relation has not been apparent. Recent papers on the S (super *) -wave are referenced here and study of their implications for field work is recommended. From earlier papers illustrations of S-waves, designated 'source shear' waves, at three Gulf Coast sites were selected for examples. The source shear wave was found to be strong, directional, and the likely cause of downgoing compressional waves by wave conversion. The mathematical S (super *) -wave and the source shear waves are SV-waves at observation points along any line through the source position if the line has an inclination of 45 degrees. Along a vertical line through the source, the wave is not detected. Because of difficulties in assembling observations at points both deep and of large offset, it is highly desirable to tie together field studies and mathematical synthetic model studies.

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