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Joint inversion of fundamental and higher mode Rayleigh waves

Chinese Journal of Geophysics (Acta Geophysica Sinica)

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Abstract

In this paper, we analyze the characteristics of the phase velocity of fundamental and higher mode Rayleigh waves in a six-layer earth model. The results show that fundamental mode is more sensitive to the shear velocities of shallow layers (< 7 m) and concentrated in a very narrow band (around 18 Hz) while higher modes are more sensitive to the parameters of relatively deeper layers and distributed over a wider frequency band. These properties provide a foundation of using a multi-mode joint inversion to define S-wave velocity. Inversion results of both synthetic data and a real-world example demonstrate that joint inversion with the damped least squares method and the SVD (Singular Value Decomposition) technique to invert Rayleigh waves of fundamental and higher modes can effectively reduce the ambiguity and improve the accuracy of inverted S-wave velocities.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Joint inversion of fundamental and higher mode Rayleigh waves
Series title:
Chinese Journal of Geophysics (Acta Geophysica Sinica)
Volume
51
Issue:
1
Year Published:
2008
Language:
Chinese
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Chinese Journal of Geophysics (Acta Geophysica Sinica)
First page:
242
Last page:
249
Number of Pages:
8