In California, earthquakes are a fact of life and when the big one will hit is anyone's guess.    

But one man says he knows exactly when the next giant quake will hit, and it's this week—Saturday, July 12th, to be exact.

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David Nabhan is a former high school science teacher who claims he can predict earthquakes. He claims he can even pinpoint the time of day, sometime between 4:45 and 7:55 a.m. a huge quake will pound the West Coast.

He told INSIDE EDITION, “A big earthquake is coming up. We're talking about the thin longitudinal swath between San Diego and Vancouver on the West Coast.”

Nabhan, who is not a seismologist, makes a shocking claim saying all earthquakes fit a pattern. He says quakes hit during a full moon and within three hours of sunrise or sunset.

Renowned Seismologist Dr. Lucy Jones of the U.S. Geological Survey says there's no way anyone can accurately predict earthquakes, saying, “Try and find some real science. Be ready for them at all times but don't pick any one particular day. That doesn't make sense.”

So, it's the scientist versus the science teacher. Will the big one hit California this Saturday? Stay tuned.