tsunami disaster mitigation system in japan
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8/10/2019 Tsunami Disaster Mitigation System in Japan
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Ts u n am i Dis as ter Mit ig at ion
Sys tem in J ap an
1.Bitter Tsunami Experienced
2.Tsunami Warning and Mitigation System
3.Outline of Disaster Management System
4.New Challenges against Tsunamis
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Historical Damaging Tsunamis alongJapanese Coast (in last 150 years)
Name (Magnitude) Year Dead orMissing
Meiji-Sanriku Earthquake and Tsunami (M8.5) 1896 22,000
Showa-Sanriku Earthquake and Tsunami (M8.1) 1933 3,064Tonankai Earthquake (M7.9) 1944 1,251 1)
Nankai Earthquake (M8.0) 1946 1,443 1)
Chile Earthquake (Mw9.5) 2) 1960 142
Tokachi-Oki Earthquake (M7.9) 1968 52 1) Nihonkai-Cyubu Earthquake (M7.7) 1983 104 1)
Hokkaido-Nansei-oki Earthquake (M7.8) 1993 230 1)
1) The number includes dead or missing from earthquakes.
2) Tsunami generated at far off Japanese coast.8
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Tsunami Warning System Elements
Communication & Transmission of Tsunami Warningto Localities & Civil Defense Authorities
Signboard
TSUN MI
Central Government
/Radio Station
TSUN MI
Radio
TV Telops, Warning maps
TSUNAMI
Localgovernment
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NHK TV Screen Image
showing Seismic Intensity by Miyagi-ken Earthquake on 26 July 2003
within 5 minutesafter theEarthquakewith/withoutTsunami Warnings
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Safe EvacuationRoute
Appropriate Risk Awaweness
of Local Communities
Promoting Basic Knowledge about“TSUNAMI” Disaster
Understanding ofHazardous Areas
+Early Warning
=
Safe Evacuation 16
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Tsunami Evacuation Route Sign 1
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Tsunami Hazard Area Tsunami Evacuation Area Tsunami Evacuation Building
Pictogram on Tsunami
There is a high possibility to be flooded in this areawhen earthquake occurs.
Safe place/hill for evacuationagainst Tsunami. Building for evacuationagainst Tsunami.
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Inundated level of previous Tsunami
Sign of Previous Tsunami Height (2)
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Tsunami Evacuation Map
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Tsunami countermeasures taken by localmunicipalities and communities (1)
Evacuation drill on Tsunami(Taro Town, Iwate Pref.)
Group session on evacuation plan(Urado-District, Kochi Pref.)
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Tsunami countermeasures taken by localmunicipalities and communities (2)
Check of the dangerous points(Nansei-Town, Mie Pref.)
Training for supplying food(Yawatahama-city, Ehime Pref.)
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Tsunami countermeasures taken by localmunicipalities and communities (3)
Meeting on the disaster map(Bungo-Takada-city, Oita Pref.)
Drill for disaster management with maps(Hyga-city, Oita Pref.)
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Letting residents incoastal areas and visitorsknow the hazard mapthrough various
opportunitiesTsunami drills
Showing information ondisaster risks andevacuation routes, etc.
Tsunami Hazard Map Susaki City
National Government prepared a guideline for help localauthorities to make and use hazard maps.
Tsunami Hazard Maps
- Identifying and showing vulnerable areas
- Enhancing people’s awareness
Purpose
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4. New challenges against Tsunamis
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Japan and its major seacoasts
Seismic areas for reinforcing and promoting disaster reductionmeasures related to the Tokai,Tonankai and Nankai Earthquakes
District (undesignated) for promoting seismic disasterreduction measures related toearthquakes along the Japan Trench
and the Chishima Trench
SurugaTrough
200 km 400 km 600 km 800 km 1,000 km
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Tokyo Inland EQ
Tokai EQ
Tonankai &Nankai EQ Japan Trench &
ChishimaTrench EQs
Possible large-scale earthquakes andtsunamis in Japan
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Estimation of damage caused by possible EQs
TokaiEQ
TonankaiNankai
EQ
Victims(persons)
Housesdestroyed
Economicloss
(billion yen)
Kobe EQ1995
9,200(7,900
by strong tremors )
18,000(8,600
by tsunamis )6,436
260,000 360,000 105,000
37,000 57,000 10,000
(Maximumcases)
(by technical investigation committees of Central Disaster Management Council)
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(formulated by Central Disaster Management Council on 30 March 2005)
Setting an overarching goalfor disaster risk reduction in the next decade
To h a lve the es t im ated death to l l and eco no m ic loss
Death toll : 9,200 persons → 4,500 Economic Loss : 37 trillion yen → 19 trillion yen Strategic goal (ex.)
- Increase the ratio of retrofitted houses : 75% (2003) → 90% (2015)
Death toll : 17,800 (8,600 by tsunamis) → 9,100 Economic Loss : 57 trillion yen → 31 trillion yen
Strategic goal (ex.)- Every municipality at risk is expected to develop hazard maps in 2015
Earthquake Disaster Risk Reduction Strategy
Tokai EQ
Tonankai & Nankai EQ
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Communities – last resort
77%23%
Police, Firefighting,Self-defense Force
FamiliesNeighbors
How the affected people wererescued in case of Great Hanshin-
Awaji EQ?approx. 35,000 persons
Need to build communities resilient to disasters,
including through enhancing public awarenessand developing hazard mapping
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