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Another
expression of long-range
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correlation in
seismicity is a
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premonitory
spreading of activity.
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The seismicity
pattern Accord (Zaliapin,
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Keilis-Borok
and Axen, 1999) represents this
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phenomenon. It
is defined as a
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simultaneous
rise of seismic activity
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in a
sufficiently large number of fault
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zones.
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