What's a scale used to measure the amount of seismic energy released by an earthquake?

the national environmental policy act (nepa) is a united states environmental law that promotes the enhancement of the environment and established the president's council on environmental quality (ceq). the law was enacted on january 1, 1970. to date, more than 100 nations around the world have enacted national environmental policies modeled after nepa.

i might be wrong but i think its a. let me know if i’m right and have a good rest of your day!