Continental Upper Mantle: T, Vs, Qs

Details Continental Upper Mantle: T, Vs, Qs Continental Upper Mantle: T, Vs, Qs

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.t33a1332b&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #T33A-1332

Physics

8123 Dynamics, Seismotectonics, 8124 Earth'S Interior: Composition And State (Old 8105), 8125 Evolution Of The Earth, 8147 Planetary Interiors (5430, 5724), 7218 Lithosphere And Upper Mantle

Scientific paper

Global maps of the thermal structure of the continental upper mantle at depths 50-150 km are compared with global Qs(-1) and Vs maps as determined from Rayleigh waves at periods between 40 and 150 seconds. This allows us to evaluate the relative contributions of thermal and non-thermal effects into seismic anomalies. Vs and Qs anomalies usually inversely correlate with lithospheric temperatures. However, the available dataset does not indicate that, at a global scale, seismic anomalies in the upper mantle are controlled solely by temperature variations. Continental maps have correlation coefficients of <0.56 between Vs and T and <0.47 between Qs and T. At 100 km depth, where the resolution of seismic models is the highest, seismic Vs and Qs are compared with theoretical Vs and Qs values that are calculated solely from temperature anomalies and constrained by experimental data on temperature dependences of velocity and attenuation. This comparison shows that temperature variations alone are sufficient to explain seismic Vs and Qs in ˜ 50% of continental regions. We hypothesize that compositional anomalies due to Fe-depletion can explain the misfit between seismic and theoretical Vs in cratonic lithosphere; partial melts and/or fluids may affect seismic parameters in regions of active tectonics.

Affiliated with

Also associated with

No associations

Rating

Continental Upper Mantle: T, Vs, Qs does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Continental Upper Mantle: T, Vs, Qs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Continental Upper Mantle: T, Vs, Qs will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1455087