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A Method of Determining of the Underground Structure by Means of SH Waves. Naota KOBAYASHI Department of Precision Mechanics, Faculty of Technology, Chuo University, Tokyo (Received Dec. 17, 1958) SH wave can advantageously used for determining the underground structure, since it is known theoretically that if one superficial layer exists on a semi-infinite elastic medium, the SH wave critically reflected at the interface shows a very large amplitude at the surface. A new method of structure determination is attempted using the above mentioned theory and basic experiments concerning the production of SH wave were carried out in a prospecting field. The results obtained by this method in the field were almost the same with those by P wave prospecting.