time-distance inversions and kernels for ring diagrams
DESCRIPTION
Time-Distance Inversions and Kernels for Ring Diagrams. Aaron Birch. Outline: TD Inversions Kernels for Ring Diagrams. Motivation. Also holography inversions:. Kosovichev, Zhao et al. Zhao et al., 2001, test inversions. Also Giles comparison with normal- mode inversions. - PowerPoint PPT PresentationTRANSCRIPT
7/18/2005CoRA, NWRA, Inc.
Time-Distance Inversions and Kernels for Ring Diagrams
Aaron Birch
Outline:A.TD InversionsB.Kernels for Ring Diagrams
7/18/2005CoRA, NWRA, Inc.
Motivation
Kosovichev, Zhao et al.
Also holography inversions:
7/18/2005CoRA, NWRA, Inc.Couvidat et al., compare ray and Born
Also Giles comparison with normal-mode inversions
Zhao et al., 2001, test inversions
7/18/2005CoRA, NWRA, Inc.From S. Korzennik, test inversions
7/18/2005CoRA, NWRA, Inc.From S. Korzennik, test inversions
7/18/2005CoRA, NWRA, Inc.
Future Work for TD Inversions
• Kernels– Green’s functions: exact vs. normal modes– Dependence on source/damping models ?
• Regularization
• How much & what kind of averaging ?
• Magnetic Fields ?– How well does treating B as c work ?
7/18/2005CoRA, NWRA, Inc.
B. Kernels for Ring-Diagrams
• Want:
• Two steps:– Linear sensitivity of U
parameters to power– Linear sensitivity of
power to local flows
)()( xvxdxKU jiji
7/18/2005CoRA, NWRA, Inc.
Example Ring Kernel, l=300,n=4
7/18/2005CoRA, NWRA, Inc.
Blue: slice through kernelBlack: 1d undamped model
7/18/2005CoRA, NWRA, Inc.
Future Work for/with Ring Kernels
• Inversions of ring data
• Joint inversion of time-distance, holography, direct modeling, and ring data, have uniform theoretical treatment
• Model systematic effects (e.g. line of sight, Postel remapping) ?
7/18/2005CoRA, NWRA, Inc.