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The great majority of earthquakes are too small to be

  • A.assigned a magnitude at all
  • B.felt by people
  • C.recorded by any instrument
  • D.located to within a hundred kilometres

Answer: B

Correct answer: felt by people

Millions of earthquakes occur each year and the overwhelming majority are too small for anyone to notice, though modern networks record them routinely and assign them magnitudes. This follows directly from the Gutenberg-Richter relation: with a \( b \) value near one, each drop of a magnitude unit brings ten times as many events.

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