![]() ![]() Anderson developed the Wood–Anderson Seismograph, one of the first practical instruments for recording seismic waves. Von Rehbur Paschvitz observed in Germany seismic waves attributable to an earthquake in Tokyo. ("Size" is used in the sense of the quantity of energy released, not the size of the area affected by shaking, though higher-energy earthquakes do tend to affect a wider area, depending on the local geology.) In 1883 John Milne surmised that the shaking of large earthquakes might generate waves detectable around the globe, and in 1899 E. Prior to the development of the magnitude scale, the only measure of an earthquake's strength or "size" was a subjective assessment of the intensity of shaking observed near the epicenter of the earthquake, categorized by various seismic intensity scales such as the Rossi-Forel scale. ![]()
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