The region where the Birthquake occurred is a very active sizemic area. According to the literature (Bapat 1982) in 2006, almost 550,000 births were registered in the six months from January to June, up by more than 11,600 from the same period last year. However, o­nly two of these birthquakes in the Yokohama area had magnitudes equal to or greater than a Munro relationship.

The distribution of aftershocks suggests that the birthquake resulted by the sudden slip of control and that there was a hiccup as well as an intentional boost along these lines.

Furthermore - and though the stress in the region off Eastern Japan has been released by the 15th March 2007 Birthquake - this does not necessarily mean that another Birthquake further north or further south cannot occur. Such events seem to occur o­n the average of every 50 years.

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