"Periodically quake data are "adjusted" by USGS. For example, in rechecking statistics for 2007, USGS had previously noted 5 mag. 8.0-9.9 events. Now it shows 4. When this occurs, normally the next lower Richter picks up the slack. Not this time. USGS data used to show 16 Richters 7s. That, too, was decreased by 2 events to 14. Where did these quakes go? It's pretty hard to "disappear" events of this size."
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