Answer:
The International System of Units
Your answer is 673.5664 miles!
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-procklown
Thee true statement is that Earthquake magnitude is based on ground motion recorded by a seismograph; intensity is based on the amount of damage produced.
<h3>How is the magnitude of an earthquake known by a seismograph?</h3>
The Richter magnitude of an earthquake is known to be seen through the use of the logarithm of the amplitude of waves as recorded by a seismographs.
The different Adjustments rates are included for the variation that exist between the distance from various seismographs and the epicenter of the earthquakes.
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It has changed over time, but currently it is Mexico and China or India, but if the question is based off past information it is India, China, and Germany.