Visualisation of edits up to 12/3/2011

Visualisation of edits up to 13/3/2011

Tags: ??, ??, ??, ??, ???, ???, visualisation visualization openstreetmap Japan earthquake saigai tsunami Sendai Miyagiken crowdsourced ??
This entry was posted on Monday, March 14th, 2011 at 10:46 am and is filed under OpenStreetMap.
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Would you mind explaining a bit more what i should see? I think i can see that indeed, most of the data has been re-entered in just a few days. Or is it that the data is shifted?
I don’t understand this map.
its a map showing the edits that went into OpenStreetMap, (a wiki map), after the tsunami hit NE Japan