Following up this article..Earthquake at Fukushima : could it be an hydrogen explosion ?
Around when M5.7 hit Fukushima at 2012/01/23 20:45:41 (JST),
radiation level increased around in Tokyo too.
Tokyo
Kanagawa
Ibaraki
This time it can’t be because of snow because it was not snowing in Kanagawa and Ibaraki at once.
They also captured hot particle of Cesium134 and Cesium137 in Tokyo.
Cesium134 : 0.0004 Bq/m3
Cesium137 : 0.0005 Bq/m3
Iori Mochizuki