12f) and |FFT| (Fig. 13f), it is helpful to recall the basic formula from which e.g. the Padé magnitude spectrum is computed, as the square root of the sum of the two power spectra, |Re(FPT)|2 and |Im(FPT)|2 according to |FPT| = {[Re(FPT)]2+[Im(FPT)]2}1/2. It ...
Lee et al. (1972) established an empirical formula for estimating the magnitude of local earthquakes using signal durations. A partially satisfactory theoretical basis for this correlation has been sought in terms of the properties of coda waves (Suteau and Whitcomb 1979; Lee and Stewart 1981). ...