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Is a magnitude 12 earthquake possible?

The magnitude scale is open-ended, meaning that scientists have not put a limit on how large an earthquake could be, but there is a limit just from the size of the earth. A magnitude 12 earthquake would require a fault larger than the earth itself. Has there ever been a 9.5 earthquake? The world's largest earthquake with an instrumentally documented magnitude occurred on near Valdivia, in southern Chile. It was assigned a magnitude of 9.5 by the United States Geological Survey. It is referred to as the "Great Chilean Earthquake" and the "1960 Valdivia Earthquake."

And another question, what is an ef5?

The term "violent tornado" is typically applied by the National Weather Service to the two strongest types, EF4 (top winds of 166-200 mph) or EF5 (greater than 200 mph). Is a F6 tornado possible? There is no such thing as an F6 tornado, even though Ted Fujita plotted out F6-level winds. The Fujita scale, as used for rating tornados, only goes up to F5. Even if a tornado had F6-level winds, near ground level, which is *very* unlikely, if not impossible, it would only be rated F5.

Has there ever been an f7 tornado?