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
1923 Great Kantō earthquake regional police and the Imperial Army used the pretext of civil unrest to liquidate political dissidents. Socialists such as (平澤計七), anarchists such as Sakae Ōsugi and Noe Itō, and the Chinese communal leader, (王希天), were abducted and killed by local police and Imperial Army, who claimed the radicals intended to use the crisis as an opportunity to overthrow the Japanese government. Director Chongkong Oh made two documentary films about the pogrom: "Hidden Scars: The Massacre of Koreans from the Arakawa River Bank to Shitamachi in Tokyo" (1983) and "The Disposed-of Koreans: The Great Kanto Earthquake and Camp Narashino" (1986). They