Uppermantle shear structure beneath Asia from multi-bounce S waves

Details Uppermantle shear structure beneath Asia from multi-bounce S waves Uppermantle shear structure beneath Asia from multi-bounce S waves

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...41..154g&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 41, Issue 2-3, p. 154-169.

Physics

28

Scientific paper

The waveforms and travel-times of multi-bounce S waves have been used to investigate the mantle shear structure beneath Asia. Teleseismic SS-S residuals were measured for midpoints in the Canadian shield and central Asia. The SS-S times for the platform areas of Asia are very close to those measured in the Canadian shield. The fold belts, in central Asia, have SS-S residuals about 6 s slower than those measured in the platform regions. Uppermantle SS and SSS waveforms are also modeled to try to better constrain the lateral structure in Asia. The Russian platform is found to be almost identical in structure to the Canadian shield. Using a new synthetic seismogram code to compute seismograms in laterally varying media, SS and SSS uppermantle data which propagated through both the fold belts and platforms, were modeled to determine the structure in the fold belts. About 5% lower velocities, in the upper 200 km, are found in the fold belts relative to the shield model.

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