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| Titel |
Structure of the upper mantle in the north-western and central United States from USArray S-receiver functions |
| VerfasserIn |
R. Kind, X. Yuan, J. Mechie, F. Sodoudi |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 6, no. 3 ; Nr. 6, no. 3 (2015-07-31), S.957-970 |
| Datensatznummer |
250115505
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| Publikation (Nr.) |
 copernicus.org/se-6-957-2015.pdf |
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| Zusammenfassung |
| We used more than 40 000 S-receiver functions recorded by the USArray
project to study the structure of the upper mantle between the Moho and the
410 km discontinuity from the Phanerozoic western United States to the
cratonic central US. In the western United States we observed the
lithosphere–asthenosphere boundary (LAB), and in the cratonic United States we observed
both the mid-lithospheric discontinuity (MLD) and the LAB of the craton. In
the northern and southern United States the western LAB almost reaches the
mid-continental rift system. In between these two regions the cratonic MLD
is surprisingly plunging towards the west from the Rocky Mountain Front to
about 200 km depth near the Sevier thrust belt. We interpret these complex
structures of the seismic discontinuities in the mantle lithosphere as an
indication of interfingering of the colliding Farallon and Laurentia plates.
Unfiltered S-receiver function data reveal that the LAB and MLD are not
single discontinuities but consist of many small-scale laminated
discontinuities, which only appear as single discontinuities after longer
period filtering. We also observe the Lehmann discontinuity below the LAB
and a velocity reduction about 30 km above the 410 km discontinuity. |
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