After the big earthquake on Friday in Japan (Richter scale: 9.0) and the resulting Tsunami waves several nuclear power plants facing major security issues. At 8:30 UTC an explosion happened the nuclear power plant in Fukushima and nuclear fusion is probable. ZAMG has calculated a possible distribution of the radioactivity cloud.
The amount of airborne radionuclides is not sure. The calculation has to be interpreted in qualitative manner only. A continuous disposal near the earth's surface (0-30m) is assumed.
Currently the possible nuclear cloud is moving east towards the Pacific Ocean. Inhabited settlements in the surrounding of the plant are not affected. But from Tuesday on possible emissions could move south towards Tokyo.