Aftershock recorded at Kushiro observatory 2 on March 11 around 08:16 (UTC). To hear the low frequency sounds the recording has been sped up 16 times.
A seismologist explains why Japan's seismic future looks even more uncertain than it did before the massive March earthquake.
Time-lapse visualisation of the March 11, 2011 earthquake off the coast of Sendai, Japan and its aftershocks.
The type of accident occurring now in Japan derives from a loss of offsite AC power and then a subsequent failure of emergency power on site. Engineers there are racing to restore AC power to prevent a core meltdown.
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