Abstract
Abstract P-wave magnitude spectra of a foreshock-mainshock-aftershock sequence on 7 and 8 May 1986 in the Aleutian Islands are determined using broad-band seismograms recorded at the GRF-array. The magnitude spectra are compared for different stations of the array. The maximum magnitude is stable with a standard deviation below 1%. The reliability of other source parameters (fault length, seismic moment and stress drop) derived from the magnitude spectrum m(f) depends on the determination of the corner period. Different methods to derive the corner period are compared. Best suited and most stable is the one based on the formula: T c = ∫ 0 ∞ E s (f) df ∫ 0 ∞ E s (f) f df where Es(f) = 102mf−14 is the energy density spectrum of the P-wave, and mf, the spectral P-wave magnitude of the earthquake at the respective period.
Published Version
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