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David Milne came up with the idea of a machine that could measure seismic activy.
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Robert Mallet proposed the theory that earthquakes moved outward from a main point, or focus.
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Grove Gilbert made the discovery that earthquakes happen on a fault line.
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Made a machine that measured the intensity of an earthquake.
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Harry Reid made a hypotheses that earthquakes were caused by built up pressure on faults.
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Andrija Mohorovii the Moho boundary, a boundary between the Earths crust and the mantle
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Charles Richter created the Richter scale, a scale that measures the intensity of earthquakes.
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