Rayleigh wave group velocity maps
description
Transcript of Rayleigh wave group velocity maps
Rayleigh wave group velocity mapsRayleigh wave group velocity maps
At short periods, group velocities are slow because of the thick, slow crust
At long periods, group velocities are neutral to fast because the crust is compensated by fast material in the upper mantle
At short periods, group velocities are slow because of the thick, slow crust
At long periods, group velocities are neutral to fast because the crust is compensated by fast material in the upper mantle
Mantle structure: depth slicesMantle structure: depth slices
Low-velocity uppermost mantle beneath North-Central Tibet
Low-velocity uppermost mantle beneath North-Central Tibet
High-velocity material at 200 km beneath most of Tibet
High-velocity material at 200 km beneath most of Tibet
Mantle structure:slice across Western Tibet
Mantle structure:slice across Western Tibet
Subduction of Indian lithosphereSubduction of Indian lithosphere
Mantle structure:slice across Central Tibet
Mantle structure:slice across Central Tibet
Detached lithosphereDetached lithosphere
Mantle structure:slice across Eastern Tibet
Mantle structure:slice across Eastern Tibet
Subduction of Asian lithosphere ???Subduction of Asian lithosphere ???
Main Belt Thrust
Yarlung-Zangbo Suture
Bangong-Nujiang Suture
Jinsha River Suture Kunlun Fault
Altyn Tagh Fault
Interpretation of the tomographic model for Tibetan region
Interpretation of the tomographic model for Tibetan region
Western Tibet1. Subduction of the Indian lithosphere2. Penetration of hot asthenospheric material
from the North3. Strong mid-crustal anisotropy is probably
caused by the extended ductile deformation of the crust
Western Tibet1. Subduction of the Indian lithosphere2. Penetration of hot asthenospheric material
from the North3. Strong mid-crustal anisotropy is probably
caused by the extended ductile deformation of the crust
0
300
dept
h (k
m)
Central Tibet1. Lithospheric detachment2. Penetration of hot asthenospheric material
from the North3. Strong mid-crustal anisotropy is probably
caused by the extended ductile deformation of the crust
Central Tibet1. Lithospheric detachment2. Penetration of hot asthenospheric material
from the North3. Strong mid-crustal anisotropy is probably
caused by the extended ductile deformation of the crust
0
300
dept
h (k
m)
Eastern Tibet1. Possible subduction of the Asian lithosphere2. Possible penetration of hot asthenospheric
material from the South3. Mid-crustal anisotropy is weaker than in
Western and Central Tibet
Eastern Tibet1. Possible subduction of the Asian lithosphere2. Possible penetration of hot asthenospheric
material from the South3. Mid-crustal anisotropy is weaker than in
Western and Central Tibet
0
300
dept
h (k
m)