The Japanese invited several physicists and mechanical technicians to Japan. None had lived in an earthquake-prone region. Finding the experience unusual, they cooperated in inventing several measuring instruments.
當時不少物理、機械科技人才被網羅至日本，這些科學家從小生長在沒有地震的地區，到了日本這多地震的國家，覺得好奇，於是合作發明瞭地震儀。