Frequency content of earthquakes

1. What is the frequency content of earthquakes?
2. What is frequency content?
3. What is frequency content parameters?
4. What is ground motion frequency content?

What is the frequency content of earthquakes?

The frequency range of seismic waves is large, from as high as the audible range (greater than 20 hertz) to as low as the frequencies of the free oscillations of the whole Earth, with the gravest period being 54 minutes (see below Long-period oscillations of the globe).

What is frequency content?

Mathematically, the frequency content of a signal is characterized by its spectral density. For deterministic energy signals (random signals are discussed in Section 11.2.4), the spectral density is the squared magnitude of its Fourier transform, (11.16) If x(t) is a pressure signal, its total energy is. (11.17)

What is frequency content parameters?

These frequency content parameters are the mean period (Tm), the average spectral period (Tavg), the smoothed spectral predominant period (To), and the predominant spectral period (Tp).

What is ground motion frequency content?

The frequency content of ground motions seems to be the most important parameter to explain the structural damage experienced during strong earthquakes. The frequency content of ground motions can be characterized using various stochastic and/or deterministic indicators.