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An area of a seismic zone in which large earthquakes are known to have occurred in the past, but in which none has occurred for a defined long time. Seismic activity is low compared to the neighboring areas of the same zone. Such an area is often considered to be the site of the next large earthquake following the idea of Fedotov (1965) who found that great earthquakes in the northern Pacific tended to occur in regions lacking earthquakes for several decades, and tended to rupture discrete segments which eventually fill the whole seismic zone without overlapping.