Sekiya Seikei (関谷 清景; 28 January 1855 – 8 January 1896), alternatively Sekiya Kiyokage, was a Japanese geologist, one of the first seismologists, influential in establishing the study of seismology in Japan and known for his model showing the motion of an earth-particle during an earthquake.
Source: “Sekiya Seikei”, English Wikipedia (CC BY-SA 4.0), excerpt