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 Colorado earthquake 2011 Colorado earthquake The 2011 Colorado earthquake occurred on August 22 at with a moment magnitude of 5.3 and a maximum Mercalli intensity of V ("Moderate"). The epicenter of the intraplate earthquake was west northwest of Trinidad, Colorado, and south of Denver, according to the United States Geological Survey (USGS). It was the largest natural earthquake to affect Colorado for more than a hundred years. The earthquake occurred as part of a swarm of smaller quakes that started the previous day. The last time the Colorado region received a series of earthquakes was in 2001, when about a dozen smaller-sized