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| Titel |
The Structure of the colliding plates beneath Tibet |
| VerfasserIn |
R. Kind, J. Zhao, X. Yuan, Z. Zhang, P. Kumar |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250039916
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| Zusammenfassung |
| We present direct observations of the structure of the tectonic plates
beneath the Tibetan plateau using seismic waves converted at
discontinuities beneath Tibet. By assembling sections of P-S and S-P
receiver function sections we map the lithosphere-asthenosphere boundary
(LAB), the Moho and the 410 and 660 discontinuities along a number of
profiles that traverse the plateau. We have identified a Tibetan plate
that is sandwiched between the Asian and Indian plates. The seismic
velocities in the Tibetan plate are slower than in the Indian and Asian
plates, suggesting a significant temperature difference and hence
different rheological behaviour of the Tibetan plate. In the westernmost
part of Tibet, the Asian plate is underthrusting beneath the Indian
plate, while in central and eastern Tibet the Indian plate is
underthrusting beneath the Tibetan plate. There are also indications of
Asian plate subduction in northern Tibet that are connected with a
thickening of the Tibetan plate. There is no indication of subduction at
the boundary between eastern Tibet and the Sichuan Basin. |
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