17 March 2011 Last updated at 13:45

Japan quake: Tremor timeline

Hundreds of aftershocks have continued to shake Japan, days after the massive magnitude 9 earthquake that triggered a devastating tsunami on Friday, 11 March.

Press the play button or use the slider to see the spread, size and frequency of earthquakes in Japan greater than magnitude 5 since 10 March.

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Source: USGS. All times are Japanese Standard Time (GMT +9 hours)

Earthquakes are measured in magnitude, on a scale ranging from minor to great. A magnitude of 6.0 and above is classified as strong and can cause severe damage. The Christchurch earthquake in New Zealand in February was 6.3.