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
2011 Guerrero earthquake similar intensities to that of the Guerrero earthquake are required per year to total the energy unleashed by a magnitude 7.5 event. Many locals perceived an apparent increase in recent earthquake occurrences, though at the time seismologists registered normal levels of seismic activity in the area. In 2009, a similar magnitude 5.8 M earthquake struck Guerrero near Acapulco at a depth of 35 km (22 mi), killing at least two people. 2011 Guerrero earthquake The 2011 Guerrero earthquake struck with a moment magnitude of 5.7 in southern Mexico at on Thursday, 5 May. It was positioned west of Ometepec, Guerrero,