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- W2084140182 abstract "This paper uses microtremor‐array measurements to obtain an overall view of S ‐wave velocity structure in the Chiayi area, Taiwan. The Rayleigh‐wave dispersion curves are calculated using the frequency‐wavenumber (![Graphic][1] ) spectrum method and then the S ‐wave velocity structure of the area is estimated by surface‐wave inversion. According to the inversion results, the S ‐wave velocities decrease from east to west. If the S ‐wave velocity of the bedrock is assumed to be 1500 m/s, the depths of the alluvium are between 560 and 1400 m gradually increasing from east to west. In order to understand the variations of the shallow S ‐wave velocity in the area, we sketch 2D and 3D maps using the imaging techniques based on interpolation algorithms. From the 3D results, the thickness of the sediments having an S ‐wave velocity in the range 270–1500 m/s increases from east to west; whereas the thickness of the layers having an S ‐wave velocity in the range 1500–2370 m/s decreases from east to west. The results are also in good agreement with the geological and geophysical information of the Chiayi area. Therefore, microtremor‐array measurement provides a good alternate to estimate shallow S ‐wave velocity structure.Online Material: Figures showing observed and calculated phase velocities, f ‐ k spectra, dispersion curves, inverted velocity models, sensitivity kernels, and V S contour maps and electric resistivity maps. [1]: /embed/inline-graphic-1.gif" @default.
- W2084140182 created "2016-06-24" @default.
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- W2084140182 date "2013-03-21" @default.
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- W2084140182 title "Near-Surface Shear-Wave Velocity Structure of the Chiayi Area, Taiwan" @default.
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- W2084140182 doi "https://doi.org/10.1785/0120110245" @default.
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!["This paper uses microtremor‐array measurements to obtain an overall view of S ‐wave velocity structure in the Chiayi area, Taiwan. The Rayleigh‐wave dispersion curves are calculated using the frequency‐wavenumber (![Graphic][1] ) spectrum method and then the S ‐wave velocity structure of the area is estimated by surface‐wave inversion. According to the inversion results, the S ‐wave velocities decrease from east to west. If the S ‐wave velocity of the bedrock is assumed to be 1500 m/s, the depths of the alluvium are between 560 and 1400 m gradually increasing from east to west. In order to understand the variations of the shallow S ‐wave velocity in the area, we sketch 2D and 3D maps using the imaging techniques based on interpolation algorithms. From the 3D results, the thickness of the sediments having an S ‐wave velocity in the range 270–1500 m/s increases from east to west; whereas the thickness of the layers having an S ‐wave velocity in the range 1500–2370 m/s decreases from east to west. The results are also in good agreement with the geological and geophysical information of the Chiayi area. Therefore, microtremor‐array measurement provides a good alternate to estimate shallow S ‐wave velocity structure.Online Material: Figures showing observed and calculated phase velocities, f ‐ k spectra, dispersion curves, inverted velocity models, sensitivity kernels, and V S contour maps and electric resistivity maps. [1]: /embed/inline-graphic-1.gif"](?object=%22This%20paper%20uses%20microtremor%E2%80%90array%20measurements%20to%20obtain%20an%20overall%20view%20of%20S%20%E2%80%90wave%20velocity%20structure%20in%20the%20Chiayi%20area%2C%20Taiwan.%20The%20Rayleigh%E2%80%90wave%20dispersion%20curves%20are%20calculated%20using%20the%20frequency%E2%80%90wavenumber%20(!%5BGraphic%5D%5B1%5D%20)%20spectrum%20method%20and%20then%20the%20S%20%E2%80%90wave%20velocity%20structure%20of%20the%20area%20is%20estimated%20by%20surface%E2%80%90wave%20inversion.%20According%20to%20the%20inversion%20results%2C%20the%20S%20%E2%80%90wave%20velocities%20decrease%20from%20east%20to%20west.%20If%20the%20S%20%E2%80%90wave%20velocity%20of%20the%20bedrock%20is%20assumed%20to%20be%201500%E2%80%89%E2%80%89m%2Fs%2C%20the%20depths%20of%20the%20alluvium%20are%20between%20560%20and%201400%C2%A0m%20gradually%20increasing%20from%20east%20to%20west.%20In%20order%20to%20understand%20the%20variations%20of%20the%20shallow%20S%20%E2%80%90wave%20velocity%20in%20the%20area%2C%20we%20sketch%202D%20and%203D%20maps%20using%20the%20imaging%20techniques%20based%20on%20interpolation%20algorithms.%20From%20the%203D%20results%2C%20the%20thickness%20of%20the%20sediments%20having%20an%20S%20%E2%80%90wave%20velocity%20in%20the%20range%20270%E2%80%931500%E2%80%89%E2%80%89m%2Fs%20increases%20from%20east%20to%20west%3B%20whereas%20the%20thickness%20of%20the%20layers%20having%20an%20S%20%E2%80%90wave%20velocity%20in%20the%20range%201500%E2%80%932370%E2%80%89%E2%80%89m%2Fs%20decreases%20from%20east%20to%20west.%20The%20results%20are%20also%20in%20good%20agreement%20with%20the%20geological%20and%20geophysical%20information%20of%20the%20Chiayi%20area.%20Therefore%2C%20microtremor%E2%80%90array%20measurement%20provides%20a%20good%20alternate%20to%20estimate%20shallow%20S%20%E2%80%90wave%20velocity%20structure.Online%20Material%3A%20Figures%20showing%20observed%20and%20calculated%20phase%20velocities%2C%20f%20%E2%80%90%20k%20spectra%2C%20dispersion%20curves%2C%20inverted%20velocity%20models%2C%20sensitivity%20kernels%2C%20and%20V%20S%20contour%20maps%20and%20electric%20resistivity%20maps.%20%5B1%5D%3A%20%2Fembed%2Finline-graphic-1.gif%22){kind=link}