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David Milne
-discussed waves moving outward from a source in a spherical manner
-sugested creating an instrument to measure the intensity and direction of the waves
-distinction was made between volcanic induced quakes and plutonic quakes -
Period: to
Seismology
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Mallet's Theories
-Irish engineer and scientist named Mallet went to Naples, Italy to study the after effects of a large earthquake
-his work created some of the earliest theories about seismology based on fact and study. His therios concluded:
-that earthquakes move outward from a central focal point -Mallet proposed the first earthquake monitoring system -
Grove Gilbert
-discoverd that earthquakes usually center around a fault line -
F. Cecchi
-builds the first time-recording seismograph on Italy -
First U.S Seismograph
-first seismograph was installed in the U.S. near San Francisco at the Lick Observatory -
B. B. Galitzen
-develops the first electromagnetic seismogragh in which a moving pendulum generates electric current ina coil, aand establishes a network of scismic stations aacross Rusia -
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 -
H. F. Reid
-an American engineer, studies survey lines across Sam Andreas fault line measured before and after San Francisco earthquake
-proposes an " Elastic Rebound" theory for the origin of earthquakes where accumulated elastic energy is released suddenly by slip on the fault -
Moho Bundary
-boundary between the earth's crust and mantle discovered by Andrija Mohorovii -
C. Richter
-proposes a magnitude scale for specifying the size of earthquakes
-logarithmic Richter scale allows a huge range of earthquakes sizes to be conveniently measured -
I. Lehmann
-discovers the eaarth's solid inner core -
Seismographs
-first digital global seismographs are installed
