Teleseismic wave front anomalies at a Continental Rift: no mantle anomaly below the central Upper Rhine Graben

Details Teleseismic wave front anomalies at a Continental Rift: no mantle anomaly below the central Upper Rhine Graben Teleseismic wave front anomalies at a Continental Rift: no mantle anomaly below the central Upper Rhine Graben

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011geoji.186..447k&link_type=abstract

Geophysical Journal International, Volume 186, Issue 2, pp. 447-462.

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Body Waves, Continental Tectonics: Extensional, Dynamics Of Lithosphere And Mantle

Scientific paper

The deep structure of the Upper Rhine Graben (URG), a continental rift in SW Germany and E France, is still poorly known. This deficit impedes a full understanding of the geodynamic evolution of this prominent rift. We study the lithosphere-asthenosphere structure using teleseismic waveforms obtained from the passive broad-band TIMO project across the central URG. The recovered, crust-corrected traveltime residuals relative to the iasp91 earth model are tiny (mostly less than 0.2-0.3 s). The average measured slowness (<1 s deg-1) and backazimuth (<5°) deviations are also very small and do not show any systematic wave front anomalies. These observed perturbation values are smaller than expected ones from synthetic 3-D ray tracing modelling with anomalies exceeding 2-3 per cent seismic velocity in the mantle. Thus there is no significant hint for any deep-seated anomaly such as a mantle cushion, etc. This result means that the rifting process did not leave behind a lower lithospheric signature, which could be clearly verified with high-resolution teleseismic experiments. The only significant traveltime perturbation at the central URG is located at its western side in the upper crust around a known geothermal anomaly. The upper crustal seismic anomaly with traveltime delays of 0.2-0.3 s cannot be explained with increased temperature alone. It is possibly related to a zone of highly altered granite. In the west of our network a traveltime anomaly (0.6-0.7 s delay) related with the Eifel plume is confirmed by the TIMO data set.

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