USGS map of the first two of the three big aftershocks today (11 March 2010), originally reported to be 7.2, 6.9 and 6.1 and later revised to 6.9, 6.7 and 6.1.
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SeisMac Graph
This is Dick's recording of the 2nd big aftershock today - originally registered at 6.9 and later downgraded to 6.7. Sudden motion sensors surrounding the hard drives in Macintosh computers are used to record the seismic motion of earthquakes.
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