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 Christchurch earthquake the most damaging in a year-long earthquake swarm affecting the Christchurch area. It was followed by a large aftershock on 13 June (which caused considerable additional damage) and a series of large shocks on 23 December 2011. Finance Minister Bill English advised that the effects of the 2011 quake were likely to be more costly than the September 2010 quake. His advice was that the 2011 earthquake was a "new event" and that EQC's reinsurance cover was already in place after the previous 2010 event. New Zealand's Earthquake Commission (EQC), a government organisation, levies policyholders to cover a major part