Whatwas the Fukushima disaster?
10-years agoin 2011tragedy struck the easterncoast of Japan as an earthquake magnitude 9.1hitthenorth-easternseaboardat 14:46 local time (05:46 GMT)on11 March 2011.A giant tsunamiquicklyswept inlanddestroying a nuclear power plant inthe Tōhoku region of Honshu. Thepower plant waslocatedon the coastatOkumaasnuclear power plantsoften utiliseseawater fortheircooling systems.TheFukushima Daiichi Nuclear Power Planthas since been decommissioned butJapaneseauthoritiesarestillagonising overwhat to do withthe leftover1.25 million tonnes of radioactive water used to cool the melted reactors.
A good overview of the disaster is the BBC video, whilst the Guardian’shighlights the immense destruction of 2011.
The disaster killedmore than 18,000 peoplewiping entire towns, likeOkuma (where theDaiichi Nuclear Power Plant is), off the map. The event hasbecome infamous forbeing:
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The world’s second-worst civilian nuclear disaster(aftertheChernobyldisaster of 1986)
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Anatural event but ahuman-induceddisaster. An independent investigationin Japanapportionedblametotheplant operator andenergy companyTokyo Electric Power (Tepco)for failing to meet safety requirements or to plan for such an event
In order to fully appreciate the scale of devastationandthe 35photographsfrom The Atlanticand from National Geographic.
The cause
Japan lies in an extremely tectonically active region of the world, on thePacific Ring of Fire(see Figure2).The earthquake was an enormous 9.1in magnitudemaking it the largest earthquakein Japan’s history andthefourthmost powerful earthquake.


A recap of the short-term impacts
The short-term refers to the immediate aftermath of an event, in this case in the days and weeks that follow a natural disaster.
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In the short term 16 people were injured in the initial explosions at the nuclear power plant
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Over 18,000 people were killed and 465,000 were evacuated
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There were increased radiation levels as far as Tokyo, 225-kilometres away
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A4-metre-highwavewastriggered at 15:27 local timewhich thepower planet seawallsuccessfully deflected(as it is builtto withstand10-metre-highwaves)
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However, a second wavewastriggeredlaterat 15:35 whichwas15-metres in height. This wave overwhelmedthe seawall. Crucially,thisdestroyedthe water pumps of the FukushimaDaiichi Nuclear Power Plant, rendering the power plantpowerless. You can seefootage of the tsunamiin this video, as itfrom 2 minutes-in
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5 out of the 6 reactorslostpower. Without a coolingmechanisma nuclear meltdownoccurs
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Ultimately,3 nuclear reactorsexploded releasingradiation
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Reactors 5 and 6werebrought under control withemergencyreplacement diesel generators
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Wastewaterwascontaminated. Seawater that is tested near theFukushima Daiichi Nuclear Power Planthad1,250 times the legal limit of iodine 131
10-years on
10-years onthe country is still experiencing theaftereffectsof such a big disaster.Japanese authorities believe it will take up to 40 yearsin totalto finish the work.
On11 March 2021 Japan recognisedand mournedthe 10-yearanniversary oftheFukushima disaster.Todaynearby roads areclosedwith40,000 peoplestill unable to return to their homesnear thepower plant,due to high levels ofradioactive contamination.2.4% of the land around thesite remainsa no-go zone in the FukushimaPrefecture.Milk and water show excessively high levels of radioactive iodineto this day.
Apublic ceremony was held in theTokyo’s national theatreto mark the anniversary(you can watch a Sky News reportonthe ceremony titled) with Emperor Naruhito saying that a decade on:
“The unforgettable memory of the tragedy”persistsa decade on.
Emperor Hironomiya Naruhito
Japan’s Prime Minister, YoshihideSuga,added thatthe challenges faced by survivors had been “compounded” by the pandemic and natural disasters, referencing a recentearthquakein Japanwhich registered 7.3in magnitude(13 February 2021).
This recent earthquake, which injured100 peopleandleft950,000 households initially without power, is an aftershock of the 2011 earthquake.Described asa decade-long-delayed aftershockitoccurredon the main shock faultplane wheretheoriginal focusoccurred.Seismologistsbelieve it hasallowedforstressto bereleasedandforreadjustmentalongthefaultline.
Since 2011, there has been a huge surge inanti-nuclear demonstrations and public concern over theenergytechnology.Anti-nuclear activists have grown substantially in the countryand as a result this form of energy production has waned.In Japan today, nuclear power now only contributes a little over 7%tothe nation’s electricity supply(notthe originally planned22% a decade ago).
Economically the earthquake and tsunami weredevasting, a total of $360 billionhas beenlost from the Japanese economysince2011.
In the long term there have been limited deaths associated with the disaster. TheWorld Health Organisation in 2013 statingthe predicted risksof cancer for the region werelow, and that there were “noobservable increases in cancer rates above[expected]baseline rates”.