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  Seismic anisotropy within the uppermost mantle of southern Germany

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

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 Creators:
Enderle, U.1, Author
Mechie, James2, Author              
Sobolev, Stephan V.3, Author              
Fuchs, K.1, Author
Affiliations:
1External Organizations, ou_persistent22              
22.2 Geophysical Deep Sounding, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_66027              
3Deutsches GeoForschungsZentrum, ou_persistent13              

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Free keywords: anisotropy, Germany, seismic refraction, upper mantle
 DDC: 550 - Earth sciences
 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.

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 Dates: 1996
 Publication Status: Finally published
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 Identifiers: eDoc: 11649
DOI: 10.1111/j.1365-246X.1996.tb06021.x
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Title: Geophysical Journal International
Source Genre: Journal, SCI, Scopus, ab 2024 OA-Gold
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Pages: - Volume / Issue: 125 (3) Sequence Number: - Start / End Page: 747 - 767 Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals180