A new significance on the vertical component ratio of the power spectra between two sites in the application of array methods

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• 作者：Xinrui Zhang ; Hitoshi Morikawa
• 关键词：Array method ; Seismic interferometry ; Ratio of imaginary part of Green鈥檚 function ; Lateral heterogeneity ; Spectral ratio
• 刊名：Journal of Seismology
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：20
• 期：1
• 页码：185-196
• 全文大小：1,149 KB
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• 作者单位：Xinrui Zhang (1)
  Hitoshi Morikawa (1)
  
  1. Department of Built Environment, Tokyo Institute of Technology, W8-22, 2-12-1, Ookayama, Meguro-ku, Tokyo, 152-8552, Japan
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geophysics and Geodesy
  Structural Geology
  Hydrogeology
  Geotechnical Engineering
  
• 出版者：Springer Netherlands
• ISSN：1573-157X

文摘

Array methods like spatial auto-correlation (SPAC) method and the centerless circular array (CCA) method have provided a convenient means of inferring the phase velocity of surface waves. However, these methods are under the assumption of horizontally layered medium (lateral homogeneity) while the ground structure is actually likely to be inclined. Hence, it is expected to obtain more detailed information of ground structure such as inclination by making better use of the records. In recent years, the seismic interferometry theory has also been widely used to estimate ground structure. According to seismic interferometry theory, the cross correlation of motion between two sites is proportional to the imaginary part of the Green鈥檚 function (IOG) between the two sites in diffuse wavefield. In this study, we can obtain the ratio of IOG between two sites by taking the ratio of power spectra between the same two sites. We propose this ratio as an indicator of the lateral heterogeneity between two sites. Through numerical simulation and a field test, we demonstrate that the significance of ratio of power spectra can be interpreted from the sight of ratio of IOG successfully. Keywords Array method Seismic interferometry Ratio of imaginary part of Green鈥檚 function Lateral heterogeneity Spectral ratio