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 EARTHQUAKES AND SEISMOLOGY
New Madrid 1811-12
San Francisco 1906

El Centro 1940
Alaska 1964
Haicheng 1975
Loma Prieta 1989
Northridge 1994
Kobe 1995
Sunquakes, Marsquakes, Moonquakes
Seismographs
Magnitude Scale
Transamerica Pyramid

Golden Gate Bridge
Tacoma Narrows Bridge
Volcanoes
EARTH'S NATURAL FREQUENCY
The Earth experiences seismic vibration. The fundamental natural frequency of the Earth is 309.286 micro Hertz. This is equivalent to a period of 3233.25 seconds, or approximately 54 minutes.
Reference:
T. Lay and T. Wallace, Modern Global Seismology, Academic Press, New York, 1995.

EXTERNAL WEB LINKS
Earthquakes for each state: US states
Please send comments and questions to Tom Irvine at: tomirvine@aol.com
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