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Mallet, an Irish engineer and scientist, studied and developed theories about earthquakes. He thought that an earthquake moved outward from a central focal point.
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Grove Gilbert discovered that earthquakes usually center around a fault line.
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Alfred Wegener was the first to introduce the theory of continental drift. His idea was rejected because of lack of evidence until 1950 when enough evidence was found to support his theory.
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The first seismograph was installed in the U.S, near San Fransisco at the Lick Observatory.
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Hugo Benioff was a seismologist. He invented the Benioff seismometer. This device was used to sense the movement of the Earth.
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Kiyoo Wadati was a seismologist. He researched subduction zone earthquakes. His name is part of the Wadati-Benioff zone.
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Giuseppe Mercalli was a seismologist who created a device to measure the intensity of damage that may be caused by an earthquake.
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Harry H. Hess was a geologist. He is best known for his work on sea floor spreading.
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A major earthquake caused by the San Andreas Fault that resulted in 3,000 deaths and destruction of San Fransisco.
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Harry Reid hypothesized that earthquakes were likely the result of the build-up of pressure along faults.
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A boundary between the earth's crust and mantle was discovered by Andrija Mohorovicic.
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Robert Dietz was a marine geologist, geophysicist and oceanographer. He discovered impact craters from meteors such as the Sudbury Basin. He was also a supporter of the theory of seafloor spreading.
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Drummond Matthews was a British marine geologist and geophysicist. He contributed to the theory of plate tectonics by helping to prove Harry Hess's theory of sea floor spreading.
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Frederick Vine is a marine geologist and geophysicist. He helped to contribute to Harry Hess's theory of sea floor spreading.
