@article{oai:repository.dl.itc.u-tokyo.ac.jp:00034085, author = {金井, 清 and 長田, 甲斐男 and 吉沢, 靜代}, issue = {3}, journal = {東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo}, month = {Sep}, note = {application/pdf}, pages = {227--234}, title = {20. Observational Study of Earthquake Motion in the Depth of the Ground. IV. : Relation between the Amplitude at Ground Surface and the Period}, volume = {31}, year = {1953} }