Transcript Supplementary Material - 2015 AGU Fall Meeting

Monitoring temporal changes with
shear wave splitting: testing the
methodology
Supplementary Material
E. Walsh, M. Savage, R. Arnold,
F. Brenguier & E. Rivemale
abstract ID #1479768, poster S43F-2530
Background Information
• A printed poster cannot contain animated
content so we have chosen to show an animated
graph similar to Figure 2 from the poster
• To view the animations start the slide show (F5)
• The animations are the property of the first
author and cannot be reused without written
permission
• The poster should be read before looking at this
content
• Extra comments on the animations are given on
the other slides
Cycle Skipping and the Incoming
Polarisation – Explanation of Graphs
The next slides contain 3 animated plots
Left plot = waveforms before and after reversing the
splitting – the p component is related to the
orientation of the original wave
Middle plot = particle motion plus fast and slow
waveforms before and after reversing the
splitting
Right plot = contour plot of the error surface – cross
hairs show the current splitting parameters. Bold
area is the 95% confidence region
Cycle Skipping and the Incoming
Polarisation – Animation 1
Cycle Skipping and the Incoming
Polarisation – Animation 2
Cycle Skipping and the Incoming
Polarisation – Comments Part 1
• When the selected point shifts to the other 95%
confidence region the particle motion flips and
points in the opposite direction.
• Corrected fast and slow waveforms show what
appears to be cycle skipping (matching another
peak/trough).
• Corrected slow waveform flips at the half way
point. The codes flip the sign of the slow
waveform displacements when a peak is matched
to a trough to make the match more obvious.
Cycle Skipping and the Incoming
Polarisation – Comments Part 2
• p ⊥ component appears to have more energy
on it when the minimum is shifted to the
other 95% confidence region.
• The p component after desplitting still has its
first peak but the second peak starts to shrink.
This waveform can also be seen slowly moving
by the delay time.