Earthquake Source Spectrum
Earthquake Source Spectrum : In the far-field measured spectra of seismic P or S waves that have been corrected for propagation path and source radiation pattern effects so as to approximate best the primary spectrum radiated by the seismic source. The shape of the source spectrum is mainly characterized by its plateau value, corner frequency and high-frequency roll-off, which are controlled by the geometry and size (seismic moment), kinematics (slip and rupture velocity) and dynamics (stress- drop, radiated seismic energy) of the earthquake rupture. Values of these source parameters can therefore, based on reasonable model assumptions, be roughly inferred from the parameters of the source spectrum
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