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addiknight26

Answer:

1960

The first observations of free oscillations of the Earth were done during the great 1960 earthquake in Chile. Presently periods of thousands of modes are known. These data are used for determining some large scale structures of the Earth interior.

Explanation:

pls mark brainliest
Around the mid 1900’s
Scientists actually used this technique to record when and where an Earthquake would happen because they didn’t have the advanced technology that we do nowadays.
They labeled the waves S waves and P waves to separate and determine the wave lengths.
I done this in my science Class before and it wasn’t actually that hard.

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