The Richter scale is one way of converting seismographic readings into numbers that provide an easy reference for measuring the magnitude M of an earthquake. All earthquakes are compared to a zero-level earthquake whose seismographic reading measures 0.001 millimeter at a distance of 100 kilometers from the epicenter. An earthquake whose seismographic reading measures x millimeters has magnitude M(x), given by M(x) = log( x/x0) where x0 = 10-3 is the reading of a zero-level earthquake the same distance from its epicenter. Determine the magnitude of each earthquake. Mexico City in 1985: seismographic reading of 125,892 millimeters 100 kilometers from the center

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