In Lima, Peru, an earthquake one day has a local magnitude of 3.5 on the Richter scale. Two weeks later, another earthquake has a local magnitude of 4.0. Which of the following MUST be true about the two earthquakes?

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In Lima, Peru, an earthquake one day has a local magnitude of 3.5 on the Richter scale. Two weeks later, another earthquake has a local magnitude of 4.0. Which of the following MUST be true about the two earthquakes?