Professor Kiyoo Wadati (和達 清夫 Wadachi Kiyoo, September 20, 1902 - January 5, 1995) was an early seismologist at the Central Meteorological Observatory of Japan, researching deep (subduction zone) earthquakes. His name is attached to the Wadati-Benioff zone. It was Wadati's 1928 paper on shallow and deep earthquakes, comparing maximum below surface displacement against distance from the epicentre, which led Charles Richter to develop his earthquake magnitude scale in 1935. he was also inspired charles ritcher.[1]