Date	Name	Human Loss/Problems	Countermeasures
3 March 1933	Showa-Sanriku Earthquake Tsunami	Casualties 3,064（missing 1,542 inclusive） 　 　 Terrible damage in Sanriku Coastal Area 　 　 　 Fires in Ohunato, Taro and Kamaishi	“Instructions for Tsunami Disaster Prevention” made in 1933 　 　 　 Resettlement to higher locations (Yoshihama, Tanohama and Ryori in Iwate Prefecture, Aikawa in Miyagi Prefecture) successful 　 　 　 Construction of sea wall in Taro and Yoshihama. 　 Tsunami control forest, revetment and seawall 　 　 　 Designation of tsunami prevention areas and evacuation roads 　 Tsunami warnings, evacuation from tsunamis 　 　 　 Commemorative activities
April 1941			Establishment of Tsunami warning organization by Sendai District branch of Meteorological Agency for the Sanriku Coastal Areas
7 December 1944	To-Nankai Earthquake Tsunami	Casualties 1,251
21 December 1946	Nankai Earthquake Tsunami	Casualties 1,330 　 　 　 Sea wall in Hiro, Wakayama Prefecture made after the 1854 Ansei Earthquake Tsunami was effective for the first time in 90 years.
4 March 1952	Tokachioki Earthquake Tsunami	Tsunami warning tentatively issued before the official use and it was effective.
1 April 1952			Tsunami Forecasting System started by the Japan Meteorological Agency
24 May 1960	Chile Earthquake Tsunami	Casualties 142 　 　 　 Tsunami warning not issued. 　 　 　 Affected area covers the Japanese Archipelago from Hokkaido to Okinawa.	Establishment of the Pacific Tsunami Warning Center (PTWC) in Hawaii 　 　 　 Construction of Tsunami bay-mouth Breakwater (Ohunato) 　 　 　 Construction of Tsunami/High Tide sea wall (all coastal areas of Japan) 　 　 　 Tsunami water gate was constructed for the first time.
16 June 1964	Niigata Earthquake Tsunami	Casualties 26 　 　 　 Damage of oil tanks, spread of oil by tsunami and fires followed. 　 　 　 Large-scale damages from liquefaction also occurred.
16 May 1968	Tokachioki Earthquake Tsunami	Casualties 52 (most deaths by the earthquake) 　 　 　 Sea wall prevented tsunami attacks well.
August 1976			Possibility of Tokai Earthquake was publicized. 　 　 　 Policy change was made from the countermeasures against the past tsunamis to expected tsunamis in the future
1977			Tsunami inundation map was made in Shizuoka Prefecture for the first time.
April 1979.4			The Deep-Ocean Tsunami Observation System was started to operate in Omaezakioki, Shizuoka and its was integrated into the national seismic observation
March 1983			“Guideline for Comprehensive Disaster Prevention Countermeasures in Tsunami-prone areas” was made. 　 　 　 The largest tsunami in the past 200 years was adopted as the Design Tsunami. 　 　 　 Integration of disaster prevention facilities, local plans and countermeasures 　 　 　 The idea was accepted that design tsunamis may cross over disaster prevention facilities.
1983.5.26	Nihonkai-chubu (Japan sea ) Earthquake Tsunami	Casualties 104 　 　 　 The first wave came after 7 minutes after the earthquake. 　 　 　 Delay of Tsunami warning by 13-15 minutes 　 　 　 Reconsideration of Tsunami education 　 　 　 Soliton fission was confirmed in the nearby waters for the first time. 　 　 　 Tetrapods were displaced. 　 　 　 Problems of filtered data in tidal station for tsunamis 　 　 　 Anglers lost their lives.	Lead time for tsunami warning was shortened by the introduction of new tsunami forecasting system.
1984.7			The Tsunami Museum was opened in Karakuwa town, Miyagi Prefecture.
1993.7.12	Hokkaido-Nanseioki Earthquake Tsunami	Casualties 202 　 　 　 Delay of tsunami warning by 5 minutes 　 　 　 Tsunami waves overflowed sea walls. 　 　 　 Fires occurred in residential area. 　 　 　 Delay in communication	4 government ministries/agencies started joint meeting for tsunami disaster prevention.
1997.3			“Guidance for Tsunami Countermeasures in Disaster Prevention Local Plan” was made. 　 Adoption of Design tsunami concept from the largest earthquake tsunami in the past and for tsunami-free areas (a tsunami caused by the largest scale earthquake imaginable to the best expert knowledge 　 Anti-earthquake/tsunami reinforcement and maintenance of Tsunami disaster prevention facilities 　 Land use planning, zoning and betterment for safety 　 Disaster prevention countermeasures (organizations, forecasting, communication, evacuations, awareness, training and response) 　 “Tsunami Disaster Forecasting Manual” was made for numerical analysis.
1999.4.1			JMA started Quantitative Tsunami Forecasting System