Physics – Geophysics
Scientific paper
2008-11-07
Physics
Geophysics
10 pages, 4 figures Has been presented at: The 27 IUGG Conference on Mathematical Geophysics, 15-20 June 2008, Longyearbyen, N
Scientific paper
High-frequency (HF) seismic radiation of large earthquakes is approximately represented by P wave trains recorded at teleseismic distances. Observed envelopes of such signals look random and intermittent, suggesting non-trivial stochastic structure. Variogram and spectral analyses were applied to instant power calculated from band-filtered observed P-wave signals from eight large (Mw=7.6-9.2) earthquakes, with 8-30 records per event and eight non-overvlapping frequency bands analyzed (total frequency range 0.6-6.2 Hz, bandwidth 0.7 Hz). Estimates for both variograms and power spectra look linear in log-log scale, suggesting in most cases self-similar correlation structure of the signal. The range for the individual-event values of the Hurst exponent H is 0.71-0.80 (averaged over bands and stations) when estimated from variograms, and 0.78-0.83 when estimated from spectra. No systematic dependence on station or frequency band was noticed. The values of H around 0.8 may be characteristic for large earthquakes in general. The result suggests that the space-time organization of earthquake rupture process has significant fractal features. Also, a useful constraint is established for application-oriented earthquake strong motion modeling.
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