More observations reee Japan quakes-

-Grid pattern is unique in that it is apparent with only 24 hrs data. Other locals require months of data before the pattern is apparent.

-Smaller quakes compose the grid, larger quakes defy it.

-many grid points show two quakes at the same location. Some of these "twins" share the depth of 6.2 miles, while others show one at 6.2 and the other at 12.4