Earth science

Earth science

Any of several geological sciences that are concerned with the earth, its origins, and all of its various structures and physical forms and phenomena.

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Earth science > Seismology

spike test

Earth science; Seismology

One type of resolution test that can be performed by looking at the impulse response to a spike. The spike is simulated by a localized velocity perturbation consisting of ...

aseismic region

Earth science; Seismology

One that is almost free of earthquakes.

first motion

Earth science; Seismology

On a seismogram, the direction of motion at the beginning of the arrival of a P wave. Conventionally, upward motion indicates a compression of the ground; downward motion, a ...

seismic

Earth science; Seismology

Of or having to do with earthquakes.

frequency response function

Earth science; Seismology

Obtained from the Fourier transform of the output signal divided by the Fourier transform of the input signal. The values of the frequency response function are the eigenvalues ...