Here is a Map of Japan showing the Nuclear Sites around the country, most of which are Nuclear Power Plants, including the one(s) suffering meltdown and radiation release.  Our network has 4 or 5 Monitoring Stations in Japan so far, including two in suburbs southwest of Tokyo, another in Saitama Prefecture, closer to Fukushima, and a fourth in Kobe at the southern end of the island of Honshu.  And recently, a Monitoring Station from Hong Kong joined the network, so look for the yellow circle at the southern end of China.

And here is a picture of the Radiation Map showing an Inset focused on the Fukushima Nuclear Power Plants on the northeast coast of the Island of Honshu, with Tokyo to the south for reference. 

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