Using a moving source to generate Rayleigh waves
Institute of Geological & Nuclear Sciences, Oct 1, 2002 - Science - 36 pages
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Power spectra of motions recorded by EARSS2 closer seismograph to the shot line
Power spectrum of difference between propagating and static source normalised to
1 other sections not shown
100m thick layer alluvium compressional wave conﬂict consistent with Rayleigh delayed sequence difference spectrum dispersion curve EARSS2 closer seismograph EARSSI seismograph further ﬁgure Figure 13 ﬁltered about 4.8Hz ﬁltered around 4.8Hz frequency domain Frequency Hz Geological & Nuclear gravels below 22m group velocity horizontal identiﬁcation individual shots Institute of Geological layer with velocity Love wave low frequencies lower Hutt valley McEwan Park motion at EARSS2 motion is clockwise Nuclear Sciences Limited p-wave Particle motion ﬁltered particle orbit phase Rayleigh wave phase velocity plane at EARSS2 Power spectrum powergel prograde progressively delayed shots pseudo-velocity radial component Radial particle motion radial/vertical plane SASW Sciences Limited 2002 seismometer shear wave proﬁles shear wave velocity shot line shown in Figure smoothed instantaneous spectrum source minus fixed source to Nuclear speciﬁc velocity spectra static source Stephenson surface waves top 22m travelling at 400m/s travelling source vertical component vertically polarised s-wave Wainuiomata waveforms wavelengths