NewParticleMotion

 

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Particle motion diagrams for selected seismic waves from the example seismograms. Plots illustrate the particle motion by plotting seismograms for two components of motion, one component on the horizontal axis and one component on the vertical axis (two horizontal components for the diagram in the upper right). The relative amplitude of ground motion in each direction is indicated by the axis labels. Numbered circles on the particle motion plots show successive times (every 1 second beginning at 17:42:07 UTC/GMT time for the P wave particle motion plots 8 s record; every 2 seconds beginning at 17:45:33 UTC/GMT time for the S wave particle motion plot 26 s record; and every 10 seconds beginning at 17:46:30 UTC/GMT time for the Rayleigh wave particle motion plots 100 s record). P-wave particle motion is shown for the Z-NS plane (upper left graph) and for the EW-NS plane (upper right graph. S-wave particle motion is shown for the Z-NS plane in the graph at the lower left. Rayleigh-wave particle motion is shown for the Z-NS plane in the graph at the lower right.

ParticleMotionPlots3DPwave%20copy

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Particle motion diagram for the P wave from the example seismograms. Three-D perspective plot illustrates the particle motion by plotting seismograms for three components of motion, two components on the horizontal axes and one component on the vertical axis. The relative amplitude of ground motion in each direction is indicated by the axis labels. Numbered circles on the particle motion plot show successive times (every 1 second beginning at 17:42:07 UTC/GMT time for the P wave particle motion 8 s record). The bold arrow shows the approximate direction (ray path) of the P wave energy arriving at the seismograph station.