Following up this article ..Earthquake at Fukushima : could it be an hydrogen explosion ?
On 4/12/2011, 4 earthquakes happened at the same place only within 20 mins.
Time 2011/4/12 14:70
Fukushima Hamatori
north latitude 37.0°
east longitude140.7°
Depth 10km
M 6.3
Time 2011/4/12 14:15
Fukushima Hamatori
north latitude 37.0°
east longitude140.7°
Depth 20km
M 4.5
Time 2011/4/12 14:26
Fukushima Hamatori
north latitude 37.0°
east longitude140.7°
Depth 20km
M 4.9
Time 2011/4/12 14:32
Fukushima Hamatori
north latitude 37.0°
east longitude140.7°
Depth 20km
M 4.1
Iori Mochizuki