HR: 0830h
AN: S31E-0809    [PDF]
TI: Comparing P and S Wave Speed Perturbations for Europe
AU: * Visser, K
EM: kvis@geo.uu.nl
AF: University of Utrecht, Budapestlaan 4, Utrecht, 3584 CD Netherlands
AU: van der Hilst, R D
EM: hilst@mit.edu
AF: University of Utrecht, Budapestlaan 4, Utrecht, 3584 CD Netherlands
AU: van der Hilst, R D
EM: hilst@mit.edu
AF: Massachusetts Institute of Technology (MIT), 77 Massachusetts Avenue, Cambridge, MA 01239 United States
AB: This study aims to improve our understanding of the temperature and composition of the mantle underneath Europe. We selected bodywave traveltime residuals of common source-receiver pairs from the reprocessed dataset of Engdahl and others. Due to the one to one correspondence between the P and S sampling, the resulting P and S wavespeed perturbation models have a similar ray coverage and therefore similar resolution properties. From these models we extracted the bulk sound speed, Poisson's ratio and $R=\partial lnV_s/\partial lnV_p$. The preliminary results show an almost constant R of 0.8 throughout the mantle except in the transition zone. Furthermore, we find a substantial difference in the Poisson's ratio between the cratonic and tectonic part of Europe. The bulk sound speed and shear wavespeed perturbations appear to be negatively correlated in most of the mantle. The correlation of the P and S wavespeed perturbations is positive and decreasing until $\sim$1500 km depth, in agreement with previous studies.
DE: 7203 Body wave propagation
DE: 7218 Lithosphere and upper mantle
SC: Seismology [S]
MN: 2003 Fall Meeting