The producers of both films probably used this "stock" sound footage from a shared vault. The same screeching sound effect can be heard in the movie "Krull" whenever one of the enemy soldiers is killed.
There's a large library of Sound Effects that lots of movie producers and directors use over and over again. Like "Lightning", telephone rings, "punching" or "fighting" sounds, various Monster roars and then there's the famous "Wilhelm Scream".
The scream you heard in both "At the Earth's Core" and "American Werewolf" most likely predates both movies.
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