Fmax 1
Fmax 1 : Above a limiting frequency, fmax, the observed spectrum of a typical local earthquake decays more steeply with increasing frequency than is expected from the standard omega-squared model. This was first recognized by Hanks (1982) and has been attributed to the earthquake source effect (e.g., Kinoshita, 1992) as well as to attenuation of the shaking by unconsolidated sediments underlying the recording site (e.g., Anderson and Hough, 1984). See also omega-squared model