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
Canadian Academy purchased land on Nagamine Heights, the Duke of Gloucester dedicated a boy's dormitory, Gloucester House, named in his honor in May 1929. The Latin Motto of "Scientia Clavis Successus," knowledge is the key to success, was chosen in 1921 as was the school song. The school housed refugees from the Great Kanto Earthquake of 1923. CA remained at the Aotani-cho campus until it closed due to World War Two. The last formal graduation ceremony took place in 1942. The Japanese government seized the school to serve as internment camps for enemy aliens. Only Gloucester House and the principal's house survived