1923 Great Kantō earthquake collapsed due to urbanization. The 1923 earthquake led to record-high morbidity due to unsanitary conditions following the earthquake, and it prompted the establishment of antityphoid measures and the building of urban infrastructure. The Honda Point Disaster on the United States west coast, in which seven US Navy destroyers ran aground and 23 lives were lost, has been attributed to navigational errors caused by unusual currents set up by the earthquake in Japan. Beginning in 1960, every September 1 is designated as Disaster Prevention Day to commemorate the earthquake and remind people of the importance of preparedness, as August and September
Kanto Plainsman all Air Force newspapers was intended as key source of command information. A Japanese-language version of the paper was published for Japanese nationals working at the above-mentioned American Air Force facilities. The final issue of Kanto Plainsman, Vol. X No. 16, was published on 24 April 1970. On that date it was merged with the Yokota Air Base newspaper The Afterburner, which was renamed the Fuji Flyer. The demise of "Kanto Plainsman" occurred soon after flying operations ceased at Tachikawa and the Air Force began its Kanto Plain Consolidation Program. MSgt George E. O'Brien was the "Kanto Plainsman"'s editor for