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Name: Po Shu W.
Status: Student
Age: 20s
Location: N/A
Country: N/A
Date: January 2001

I am looking for a seismogram that has the Earth's free oscillation frequency period indicated on it. Please help.

This is not an easy question because the earth is not a homogeneous body, and different seismic vibration types and sources all travel at different speeds and have different "fingerprints". I believe there is some discussion of seismic activity in either Scientific American or Discover magazine in the last month or two.

If you search on the engine terms "seismic vibrations earth" you will find a number of sites that deal with your question at differing levels of sophistication.

Vince Calder

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