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Perspectives of the S-Receiver-Function Method to Image Upper Mantle Discontinuities

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/persons/resource/kind

Kind,  R.
2.4 Seismology, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/yuan

Yuan,  X.
2.4 Seismology, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Zitation

Kind, R., Yuan, X. (2019): Perspectives of the S-Receiver-Function Method to Image Upper Mantle Discontinuities. - In: Yuan, H., Romanowicz, B. (Eds.), Lithospheric Diskontinuities, (Geophysical Monnograph Series ; 139), Hoboken, NJ, USA : John Wiley & Sons, Inc., 139-154.
https://doi.org/10.1002/9781119249740.ch8


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_4792892
Zusammenfassung
High‐resolution imaging of structures in the mantle–lithosphere is still the main problem for understanding the dynamics that form the surface of the Earth. The wealth of seismic broadband data processed with the S‐receiver‐function technique can contribute significantly to the progress in this field. Images of 49,000 selected S‐receiver functions from European stations and 39,000 from North American stations exhibit complicated structural elements within the upper mantle in both continents. The lithosphere–asthenosphere boundary (LAB) is observed near 100 km depth in tectonically active cratonic margins, and near 200 km depth beneath the European and North American cratons. Within the cratonic lithosphere, a midlithospheric discontinuity (MLD) is observed at depths of about 100 km. We also observed inclinations of these structures at the margins of the cratons, probably indications of fossil continental collision. The Lehmann discontinuity is also observed in both continents, along with a low‐velocity zone above the 410 km discontinuity. These results indicate that the S‐receiver‐function technique is a powerful method for illuminating upper mantle structures, and more dense station deployments will lead to even higher resolution images and consequently new geological findings.