Walk-along surface wave survey: A new method for the high-resolution near-surface S-wave velocity structure imaging

2019 ◽  
Author(s):  
Tomio Inazaki ◽  
Hiroshi Kisanuki ◽  
Takaho Kita ◽  
Koichi Hayashi
Keyword(s):  
Surface Wave ◽  
High Resolution ◽  
Wave Velocity ◽  
Velocity Structure ◽  
New Method ◽  
S Wave ◽  
Near Surface

Estimating deep S-wave velocity structure in the Los Angeles Basin using a passive surface-wave method

2013 ◽  
Vol 32 (6) ◽  
pp. 620-626 ◽  
Author(s):  
Koichi Hayashi ◽  
Antony Martin ◽  
Ken Hatayama ◽  
Takayuki Kobayashi
Keyword(s):  
Surface Wave ◽  
Los Angeles ◽  
Wave Velocity ◽  
Velocity Structure ◽  
Wave Method ◽  
S Wave ◽  
Los Angeles Basin ◽  
Surface Wave Method

Love-wave waveform inversion in time domain for shallow shear-wave velocity

Geophysics ◽  
2016 ◽  
Vol 81 (1) ◽  
pp. R1-R14 ◽  
Author(s):  
Yudi Pan ◽  
Jianghai Xia ◽  
Yixian Xu ◽  
Lingli Gao ◽  
Zongbo Xu
Keyword(s):  
Surface Wave ◽  
Wave Velocity ◽  
Time Domain ◽  
Love Wave ◽  
Waveform Inversion ◽  
Dispersion Curves ◽  
Gradient Algorithm ◽  
S Wave ◽  
Near Surface ◽  
Earth Models

High-frequency surface-wave techniques are widely used to estimate S-wave velocity of near-surface materials. Surface-wave methods based on inversions of dispersion curves are only suitable to laterally homogeneous or smoothly laterally varying heterogeneous earth models due to the layered-model assumption during calculation of dispersion curves. Waveform inversion directly fits the waveform of observed data, and it can be applied to any kinds of earth models. We have used the Love-wave waveform inversion in the time domain to estimate near-surface S-wave velocity. We used the finite-difference method as the forward modeling method. The source effect was removed by the deconvolution technique, which made our method independent of the source wavelet. We defined the difference between the deconvolved observed and calculated waveform as the misfit function. We divided the model into different sizes of blocks depending on the resolution of the Love waves, and we updated the S-wave velocity of each block via a conjugate gradient algorithm. We used two synthetic models to test the effectiveness of our method. A real-world case verified the validity of our method.

Making of 3D S-wave velocity structure model by passive surface wave method at the inside of a test circuit road

2019 ◽  
Author(s):  
Takayuki Kobayashi ◽  
Takanori Ogahara ◽  
Tomio Inazaki ◽  
Hiroshi Kisanuki ◽  
Chisato Konishi ◽  
...  
Keyword(s):  
Surface Wave ◽  
Wave Velocity ◽  
Velocity Structure ◽  
Wave Method ◽  
Structure Model ◽  
S Wave ◽  
Test Circuit ◽  
Surface Wave Method
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