Abstract
Models derived from controlled source seismology (reflection and refraction data) and long-period seismology provide the impression that the upper mantle is rather homogeneous. For near-vertical reflections the mantle appears transparent if compared to the reflective lower crust. Mantle reflections are sometimes observed, but as discrete reflections rather than spatially distributed reflectivity. Refraction data allow the observation of a Pn phase which serves to define a sub-Moho velocity or velocity gradient. Long-range observations define discrete velocity contrasts in the mantle, but again the models display a mantle which is mostly homogeneous on the scale of many wavelengths.
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© 1997 Springer Science+Business Media Dordrecht
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Wenzel, F., Fuchs, K., Tittgemeyer, M., Ryberg, T. (1997). Small-Scale Heterogeneities of the Upper Mantle. In: Fuchs, K. (eds) Upper Mantle Heterogeneities from Active and Passive Seismology. NATO ASI Series, vol 17. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-8979-6_21
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DOI: https://doi.org/10.1007/978-94-015-8979-6_21
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