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Milne suggested that a machine could be invented to measure seismic activity. -
Robert Mallet, an Irish engineer and scientist, studied and developed theories about earthquakes. He thought that an earthquake moved outward from a center focal point. -
Grove Gilbert discovered that earthquakes usually occur around a fault line. -
The first US seismograph was installed at the Lick University, near San Francisco. -
Giuseppe Mercalli was a seismologist who created a device to measure the intensity or likelihood of damage that may be caused in an earthquake. -
Harry Reid hypothesized that earthquakes were likely the result of pressure along faults. -
A boundary between Earth's crust and mantle was discovered by Andrya Mohorovii. -
Charles Richter creates a Richter Scale to measure the intensity of Earthquakes. -
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