Radiation dispersion forecast is available from the Switzerland Meteocentrale website.

Contrarily to previous announcement on SurvivalJapan, Meteocentrale uses MEXT data so it is not entirely reliable (Cf. Problematic Japanese Environment Radiation Readings on SurvivalJapan). However, MEXT data only for Fukushima ground zero should be trustworthy.

Here is a screenshot of their radiation dispersion movie for Japan today.

2011 Sept. 9 – Tokyo and Hokkaido are out of the fall-out today as the anticyclone which has been pushing it back is now gone.

Meteocentrale Radiation Dispersion over Japan on September 9

2011 Sept. 9 – Earthquake notice near Fukushima

An earthquake rattled Japan’s tsunami-ravaged northeast coast late on Thursday, but there were no immediate reports of further damage and no tsunami alert.

The tremor struck under the Pacific Ocean, not far from the epicenter of the March 11 quake-tsunami disaster that killed more than 20,000 people and triggered the world’s worst nuclear crisis since Chernobyl 25 years ago.

The latest earthquake had a magnitude of 5.2, the US Geological Survey said, at a depth of 29 kilometers.

It hit at 10:38 p.m., 137 kilometers from Fukushima, site of the crippled nuclear plant that has been spewing radiation since March’s catastrophe.

© 2011 AFP

This is only the strongest (so far) of a series of minor earthquakes that have occured in the region and Hokkaido this week as can be seen on the Japan Meteorological Agency Earthquake Information page (click several times on the “Previous Information” on top on the map).

2011 Sept. 9 – Cumulative Radiation Dose in Tokyo

Reference value for 6 months average exposure in north-east Tokyo and Tsukuba : @ 0.25 uSv/h :  1 mSv.

According to some countries, this should be the maximum yearly dose for the general public (pregnant and breast-feeding women and children is less). Therefore it should be the time to evacuate the concerned area to other parts of Tokyo at least (past time for children et al.). No data available for the north of Tokyo (Koshigaya, Kasukabe…) : caution should be applied.

Safecast data - last update on 2011 September 4

Read Switzerland Meteocentrale Provides Radiation Dispersion Forecast on SurvivalJapan.


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