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Rayleigh-wave dispersion reveals crust-mantle decoupling beneath eastern Tibet
Cédric P Legendre1,2, Frédéric Deschamps1, Li Zhao1
1Institute of Earth Sciences, Academia Sinica, 128 Academia Road, Sec. 2, Nangang, Taipei 11529, Taiwan.
Scientific Reports
|November 10, 2015
Summary
The Tibetan Plateau
Area of Science:
- Geophysics
- Tectonics
- Seismology
Background:
- The Tibetan Plateau's formation is attributed to the Indian and Eurasian Plate collision.
- Its tectonics involve eastward crustal extrusion, explained by crust-lithosphere decoupling or lithospheric deformation models.
Purpose of the Study:
- To differentiate between crust-lithosphere decoupling and lithospheric deformation models.
- To constrain crustal and lithospheric mantle deformation in eastern Tibet.
Main Methods:
- Mapping Rayleigh-wave azimuthal anisotropy using China National Seismic Network (CNSN) data.
- Analyzing seismic anisotropy patterns at periods sampling the crust and lithospheric mantle.
Main Results:
- Anisotropic patterns in eastern Tibet's crust indicate eastward flow and southward bending.
- Lithospheric mantle anisotropy aligns with absolute plate motion in eastern Tibet.
- Sino-Korean and Yangtze cratons show consistent anisotropy, suggesting coupled crust and mantle.
Conclusions:
- Crust and lithospheric mantle are mechanically decoupled beneath eastern Tibet.
- Crust and lithospheric mantle are coupled beneath the Sino-Korean and Yangtze cratons.
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