Fukushima nuclear disaster: 5 years since the Tohoku earthquake and tsunami on 2011/3/11 at 14:46:24

5 years and many lessons learnt since the Tohoku and Fukushima disasters

Tohoku disaster and Fukushima nuclear disaster lead to Japan’s energy market liberalization

Tohoku disaster: On Friday March 11, 2011 at 14:46:24, the magnitude 9.0 “Great East Japan earthquake” caused a tsunami, reaching up to 40.4 meters high inland in Tohoku.

Japan’s National Police Agency registers 15,894 deaths and 2,562 missing people.

TEPCO’s Fukushima Dai-1 nuclear power plant vs Tohoku Electric Power Corporation’s Onagawa Nuclear Power Plant

One of the world’s worst nuclear disasters started at Tokyo Electric Power (TEPCO) Fukushima Dai-1 Nuclear Power Plant.

The Onagawa Nuclear Power Plant, owned and operated by Tohoku Electric Power Company, and built under Yanosuke Hirai, was closest to the 2011/3/11 earthquake’s epicenter, and survived the quake without major damage and was successfully shut down, and served as a refuge for 300 people from the neighborhood who had lost their homes. There were radiation alarm signals at Onagawa Power Station, but these alarms were caused by radioactive fallout blown from Fukushima-Dai-Ichi by winds, and did not originate from Onagawa.

The Onagawa Nuclear Power Plant was the only nuclear power plant in the region of the Tohoku Earthquake that survived the earthquake without any major damage.

On Yanosuke Hirai’s insistence, Tohoku Electric Power Company built Onagawa Nuclear Power Plant at 13.8 meters above sea level, while during the construction of TEPCO’s Fukushima Dai-1 plant the natural ground elevation was reduced from 35 meters to 10 meters. The Tsunami reached 13 meters height in both locations.

In 1990 Tohoku Electric Power Company (Onagawa Nuclear Power Station Construction Office) published a detailed analysis of the Great Jogan Tsunami of AD 869

Yanosuke Hirai had researched the Great Jogan Tsunami of July 13, 869, which was caused by the 869 Sanriku Earthquake (貞観地震). The results were taken into account in planning the Onagawa Nuclear Power Station, and published in 1990:

Hisashi Abe, Toshisada Sugeno, Akira Chigama, (Onagawa Nuclear Power Station Construction Office)
“Estimation of the Height of the Sanriku Jogan 11 Earthquake-Tsunami (AD 869) in the Sendai Plain”
Zisin (Journal of the Seismological Society of Japan, 2nd Series), Vol. 43 (1990) No. 4 P 513-525

See also the “869 Sanriku earthquake” entry in Wikipedia.

Fukushima nuclear disaster mitigation. US sends 150 nuclear experts headed by Chuck Casto to work with the Japanese Prime Minister and top leaders for 11 months to help deal with the Fukushima disaster

The USA sent a team of about 150 nuclear experts for 11 months to Japan to assist TEPCO and the Japanese Government in mastering the nuclear crisis. This team was headed by Chuck Casto – read some of his conclusions here:

Japan’s first ever Parliamentary Commission

Japan’s Parliament for the first time ever created an Independent Parliamentary Commission to analyze the nuclear disaster, headed by Kiyoshi Kurokawa, read the summary of his talk “Groupthink can kill” here (including videos describing the Commissions results in simple easy to understand terms).

Three former TEPCO executives have now been indicted by a citizen’s prosecution committee.

Nuclear disaster leads to energy market liberalization in Japan

Japan’s faith in nuclear power was shaken, leading to development of renewable energy, liberalization and long overdue reforms of Japan’s energy sector.

Quakes and after-quakes

The figures show that more than 300 earthquakes of magnitude 5 or larger occurred since the major quake on March 11, 2011 at 14:46. The epicenters of quakes lie mostly where the Pacific Plate moves under the North American Plate on which Tohoku lies.

According to our knowledge earth quakes are mathematically speaking a “chaotic” phenomenon, and scientific arguments are, that it is difficult if not impossible to predict earth quakes with precision. (Figure: Wolfram Alpha LLC)

Earth quakes of magnitude 5 and greater in Japan (March-April 2011) (Figure: Wolfram Alpha LLC)
Earth quakes of magnitude 5 and greater in Japan (March-April 2011) (Figure: Wolfram Alpha LLC)
Earth quakes of magnitude 5 and greater in Japan (March-April 2011) on logarithmic magnitude scale (Figure: Wolfram Alpha LLC)
Earth quakes of magnitude 5 and greater in Japan (March-April 2011) on logarithmic magnitude scale (Figure: Wolfram Alpha LLC)

Nuclear fallout on Tokyo: radiation levels in Tokyo/Shinjuku

Starting with Tuesday 15 March 2011, radioactive fallout came down on Tokyo as shown in the figures below.

Radiation in Tokyo/Shinjuku (until April 13, 2011) compared to Austria
Radiation in Tokyo/Shinjuku (until April 13, 2011) compared to Austria

Radiation levels in Tokyo (Shinjuku and Shibuya) and Tsukuba:

Radiation in Tsukuba (until April 13, 2011) compared to Austria
Radiation in Tsukuba (until April 13, 2011) compared to Austria

The blue curve above shows the radiation levels in Tokyo/Shinjuku as measured and published by the Tokyo Metropolitan Institute for Public Health here:

  • each hour for the last 24 hours
  • daily starting March 1

The red curves show maximum and minimum data as measured by TEPCO in Tokyo-Shibuya, and published here: TEPCO radiation data

The green curves show radiation data measured by Japan’s highly respected AIST Laboratory in Tsukuba (Ibaraki-ken, about 60 km north of Tokyo in direction of Fukushima) and published here: AIST radiation data.

Radiation levels in Tsukuba

The green curves show radiation data measured by AIST Laboratory in Tsukuba (Ibaraki-ken, about 60 km north of Tokyo in direction of Fukushima) and published here: AIST radiation data.

The radiation measurement results in Tsukuba are considerably higher than found in Tokyo, but have decreased close to the top levels found naturally in Austria and in many other countries.

The differences in the data between Tokyo and Tsukuba could be because Tsukuba is 60km closer to Fukushima, could be caused by weather conditions, but they could also be caused by differences in the measurement equipment or a combination of these factors.

Eurotechnology-Japan newsletters in March/April 2011

In a series of newsletters, our company informed our customers, and friends about the nuclear disaster impact on Tokyo. Our newsletters were reposted by our readers to 100s of friends, and in some cases influenced the decisions by foreign subsidiaries here in Tokyo. In the days following the nuclear disaster, it was difficult for non-phycists to understand the true situation, and what the radioactive fallout really meant.

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