Sounds like Berkland uses the "shotgun" technique. Throw enough lead around and you're bound to get a bullseye once in while.
I've spent a great deal of time and effort in evaluating the predictions made by Jim Berkland in his monthly newsletters. He predicts for 4 areas and each area has the same magnitude range every month. His predictions are well suited to the effort because they are identical except for dates. This means that the probability of success is identical which is necessary for statistical evaluation of probability.
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Berkland retired in 1994 and continues to be a voice in the wilderness. Andy Michael, a geophysicist with the USGS in Menlo Park said his agency has "never been able to find any support for his claims. "Michael said that Berkland predicts so many quakes that he's bound to be right on occasion. "Based on the moon, he makes a prediction of something to happen every month," Michael said. "There are studies of lunar tides that show you can find an extremely small effect, but it's not large enough to be useful. The literature goes back decades."
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