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The Development of Seismology
Transcript of The Development of Seismology
John Winthrop: The Creator
first person to study an earthquake
First Idea of Seismograph
David Milne first suggested that a machine could be used to measure seismic activity
First Time-Recording Seismograph in Italy
built by F. Cecchi
First Seismograph in North America
installed at Lick Observatory near San Jose, California
recorded 1906 San Francisco Earthquake
1906 San Francisco Earthquake
major earthquake caused by the San Andreas Fault
killed about 3,000 people
Also in 1906
The Mercalli Intensity Scale
Giuseppe Mercalli (Italian seismologist) made the first seismograph, but it wasn't very accurate so they made it into a device that measures how much damage an earthquake can do
Discovery of Moho Boundary
Andrija Mohorovii discovered a boundary between the earth's crust and mantle
This boundary helped us better understand earth's interior
B. Gutenburg publishes Time-Travel Tables that include core phases (seismic waves that reflect from the core), and accurately estimates the depth of the earth's fluid core (2,900 kilometers)
The Richter Scale
Charles Richter made the first accurate seismograph known as the Richter Scale to determine an earthquake's magnitude
I. Lehmann discovers earth's solid core
Final Time-Travel Tables
H. Jeffries and K. Bullen publish final versions of their travel time for many seismic phases
they were accurate enough to still be used today
Seismology has grown so much more advanced since the first idea in 1700.
Many more discoveries of the earth's core are being made almost every day.
The Elastic Wave Theory
theory suggests that you can hit a solid object and waves of energy will travel through the object and cause movement; thought to be the cause of earthquakes
The geophysical science of earthquakes and the mechanical properties of the earth
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