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Heng invented the first seismoscope an instrument that could index the occurrence of an earthquake.
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Mallet presented to the Royal Irish Academy his paper, "On the Dynamics of Earthquakes",[ which is considered to be one of the basics of modern seismology. He is also credited with making the word "seismology"
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Gilbert discovered that earthquakes usually center around a fault line.
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Milne an English seismologist created the 'horizontal pendulum seismograph.'
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This scale uses the observations of the people who experienced the earthquake to estimate its intensity.
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Harry F. Reid, a geogolist that originated the "elastic rebound" theory of earthquakes on the basis of the 1906 data from the Great San Francisco Earthquake.
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In 1935, Richter developed the 'Richter Scale.' It is also known as Richter magnitude scale. It is used to measure the intensity of the earthquake.