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David Milne
Milne suggested that a machine could be invented to measure seismic activity. -
Mallet's Theories
Mallet, an Irish engineer and scientist, studied and developed theories about earthquakes. He thought that an earthquake moved outward from a central focal point. -
Grove Gilbert
Grove Gilbert discovered that earthquakes usually center around a fault line. -
First U.S.Seismograph
The first seismograph was installed in the U.S, near San Fransisco at the Lick Observatory. -
The Mercalli Intensity Scale
Giuseppe Mercalli was a seismologist who created a device to measure the intensity or likelihood of damage that may be caused by an earthquake. -
The San Fransisco Earthquake
A major earthquake caused by the San Andreas Fault that resulted in 3,000 deaths and destruction of San Fransisco. -
Harry Reid
Harry Reid hypothesized that earthquakes were likely the result of the build-up of pressure along faults. -
Moho Boundary
A boundary between the earth's crust and mantle was discovered by Andrija Mohorovii. -
The Richter Scale
Charles Richter created the first seismograph. He used the Richter Scale to measure the magnitude of earthquakes.
