<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Attenuation of Ground-Motion Spectral Amplitudes in Southeastern Australia"^^ . "A dataset comprising some 1200 weak- and strong-motion records from\n84 earthquakes is compiled to develop a regional ground-motion model for south-\neastern Australia (SEA). Events were recorded from 1993 to 2004 and range in size\nfrom moment magnitude 2.0 <= M <= 4.7. The decay of vertical-component Fourier\nspectral amplitudes is modeled by trilinear geometrical spreading. The decay of low-\nfrequency spectral amplitudes can be approximated by the coefficient of R^(-1.3)\n(where\nR is hypocentral distance) within 90 km of the seismic source. From approximately\n90 to 160 km, we observe a transition zone in which the seismic coda are affected\nby postcritical reflections from midcrustal and Moho discontinuities. In this hypo-\ncentral distance range, geometrical spreading is approximately R^0.1. Beyond\n160 km, low-frequency seismic energy attenuates rapidly with source–receiver distance, having a geometrical spreading coefficient of R^(-1.6). The associated regional\nseismic-quality factor can be expressed by the polynomial: log Q(f) = 3.66 - 1.44\nlog f + 0.768 (log f)^2 + 0.058 (log f)^3\nfor frequencies 0.78 <= f <= 19.9 Hz.\nFourier spectral amplitudes, corrected for geometrical spreading and anelastic attenuation, are regressed with M to obtain quadratic source scaling coefficients. Modeled vertical-component displacement spectra fit the observed data well. Amplitude\nresiduals are, on average, relatively small and do not vary with hypocentral distance.\nPredicted source spectra (i.e., at R = 1 km) are consistent with eastern North American (ENA) models at low frequencies (f less than approximately 2 Hz) indicating\nthat moment magnitudes calculated for SEA earthquakes are consistent with moment\nmagnitude scales used in ENA over the observed magnitude range.\nThe models presented represent the first spectral ground-motion prediction equations developed for the southeastern Australian region. This work provides a useful\nframework for the development of regional ground-motion relations for earthquake\nhazard and risk assessment in SEA."^^ . "2007-08" . . "97" . "4" . . "Seismological Society of America"^^ . . . "Bulletin of the Seismological Society of America"^^ . . . "00371106" . . . . . . . . . . . . . . . . "J. F."^^ . "Schneider"^^ . "J. F. Schneider"^^ . . "T. I."^^ . "Allen"^^ . "T. I. Allen"^^ . . "P. R."^^ . "Cummins"^^ . "P. R. Cummins"^^ . . "T."^^ . "Dhu"^^ . "T. Dhu"^^ . . "Geologic Hazards Team, U.S. Geological Survey, Golden, Colorado 80401"^^ . . . . . . "HTML Summary of #1357 \n\nAttenuation of Ground-Motion Spectral Amplitudes in Southeastern Australia\n\n" . "text/html" . . . "Path and site effects" . .