When the Parkfield Prediction Experiment was launched in the 1980's, an equivalent of this figure was shown, plotting the sequential numbers of the Parkfield earthquakes (six events between 1857 and 1966) versus the fractional month of the year of each event. The six previous Parkfield events occurred on 1/9/1857, 2/2/1881, 3/3/1901, 3/10/1922, 6/8/1934, and 6/28/1966. A respected seismologist was heard to observe that, whatever year the next Parkfield earthquake occurred, it would clearly be in the month of August or September (Allan Lindh, personal communication, 2004). One is not inclined to believe that this prediction was intended to be serious....

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