Find the magnitude of the given earthquake. (Round your answer to one decimal place.) An earthquake was measured by three seismographs. The closest, 60 kilometers from the epicenter, recorded a maximum amplitude of 23 ?m. A second seismograph 220 kilometers from the epicenter recorded a maximum amplitude of 4 ?m. The third seismograph, 340 kilometers from the epicenter, recorded a maximum amplitude of 0.92 ?m. (The logarithm of the amplitude of the standard earthquake at a distance of 60 kilometers is −2.8, 220 kilometers is −3.6, and 340 kilometers is −4.2.)

Find the magnitude of the given earthquake. (Round your answer to one decimal place.) An earthquake was measured by three seismographs. The closest, 60 kilometers from the epicenter, recorded a maximum amplitude of 23 ?m. A second seismograph 220 kilometers from the epicenter recorded a maximum amplitude of 4 ?m. The third seismograph, 340 kilometers from the epicenter, recorded a maximum amplitude of 0.92 ?m. (The logarithm of the amplitude of the standard earthquake at a distance of 60 kilometers is −2.8, 220 kilometers is −3.6, and 340 kilometers is −4.2.)

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Find the magnitude of the given earthquake. (Round your answer to one decimal place.)

An earthquake was measured by three seismographs. The closest, 60 kilometers from the epicenter, recorded a maximum amplitude of 23 ?m. A second seismograph 220 kilometers from the epicenter recorded a maximum amplitude of 4 ?m. The third seismograph, 340 kilometers from the epicenter, recorded a maximum amplitude of 0.92 ?m. (The logarithm of the amplitude of the standard earthquake at a distance of 60 kilometers is −2.8, 220 kilometers is −3.6, and 340 kilometers is −4.2.)