English
 
Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Seismic anisotropy within the uppermost mantle of southern Germany

Authors

Enderle,  U.
External Organizations;

/persons/resource/jimmy

Mechie,  James
2.2 Geophysical Deep Sounding, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/stephan

Sobolev,  Stephan V.
Deutsches GeoForschungsZentrum;

Fuchs,  K.
External Organizations;

External Ressource
No external resources are shared
Fulltext (public)

237217.pdf
(Publisher version), 3MB

Supplementary Material (public)
There is no public supplementary material available
Citation

Enderle, U., Mechie, J., Sobolev, S. V., Fuchs, K. (1996): Seismic anisotropy within the uppermost mantle of southern Germany. - Geophysical Journal International, 125, 3, 747-767.
https://doi.org/10.1111/j.1365-246X.1996.tb06021.x


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_237217
Abstract
This paper presents an updated interpretation of seismic anisotropy within the uppermost mantle of southern Germany. The dense network of reversed and crossing refraction profiles in this area made it possible to observe almost 900 traveltimes of the P(tief)n phase that could be effectively used in a time-term analysis to determine horizontal velocity distribution immediately below the Moho. For 12 crossing profiles, amplitude ratios of the P(tief)n phase compared to the dominant crustal phase were utilized to resolve azimuthally dependent velocity gradients with depth. A P-wave anisotropy of 3–4 per cent in a horizontal plane immediately below the Moho at a depth of 30 km, increasing to 11 per cent at a depth of 40 km, was determined. For the axis of the highest velocity of about 8.03 km s(hoch)-1 at a depth of 30 km a direction of N31°F was obtained. The azimuthal dependence of the observed P(tief)n amplitude is explained by an azimuth-dependent sub-Moho velocity gradient decreasing from 0.06 s(hoch)−1 in the fast direction to 0 s(hoch)−1 in the slow direction of horizontal P-wave velocity. From the seismic results in this study a petrological model suggesting a change of modal composition and percentage of oriented olivine with depth was derived.