ユーイングの円盤記録式地震計について

概要

論文の詳細を見る
James Alfred Ewing (1855-1935) made various improvements to the horizontal seismograph that in 1880 first recorded the ground motion of an earthquake. He also designed a vertical seismograph. Scientists that followed him combined these mechanisms into a three-component seismograph. A photograph in the collection of the National Museum of Nature and Science is perhaps the only one in existence showing the form of this early seismograph, which recorded on a rotating smoked glass plate. The Museum also preserves a notebook with entries of earthquake measurements from 1881 to 1885 at the College of the Tokyo University at Hitotsubashi. This was where Ewing, accompanied by Seikei Sekiya (1854-1896), conducted experiments using seismographs. This document, probably written by Sekiya for the most part, demonstrates the progress made in the early stages of disc-recording seismographs.