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Active zone
size, AZS, is a measure of the
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extent to
which seismicity in a given
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region is
diffused. Its premonitory
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efficiency was
first observed in modeling.
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AZS is more
directly a measure of the
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broadening of
small to moderate size
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events, which
leads to development of a
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nucleation
region associated with a
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coming large event.
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