Measuring the fractal dimension of the seismic source through the high-frequency fall-off of source spectra

摘要

Using the Wigner-distribution estimation, the high-frequency fall-off of source spectra was estimated. The technique was applied to the analysis of the source spectra of the July 22, 1994, Vladivostok M6.4 deep-focus earthquake and that of the July 22, 1994, Northern Japan Sea M5.7 deep-focus earthquake. It is shown that the high-frequency fall-off of the source spectra of these two earthquakes may be characterized by two parts. Between the first corner frequency f(sub 1) and the second corner frequency f(sub 2), the high-frequency fall-off of the source spectra can be represented by f(sup 5.0): above f(sub 2), the high-frequency fall-off can be represented by f(sup 1.4). (author). 12 refs, 3 figs, 1 tab. (Atomindex citation 27:043901)