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Nadeau et al.
(1995) suggested to use the
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average depth
of hypocenters in a given
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time window
claiming that deepening of
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seismic
activity precede large earthquakes.
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It is
necessary to note that the depth is one of
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the most
inaccurate parameters of
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hypocenter
determination: the error in
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depth may be
large resulting seismologist
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attributed values in
many cases.
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