Dipping-interface Mapping Using Mode-separated Rayleigh Waves |
| |
| Authors: | Yinhe Luo Jianghai Xia Yixian Xu Chong Zeng Richard D Miller Qingsheng Liu |
| |
| Institution: | (1) Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan, Hubei, 430074, China;(2) Kansas Geological Survey, The University of Kansas, 1930 Constant Avenue, Lawrence, Kansas 66047-3724, USA;(3) State Key Laboratory of Geological Processes and Mineral Resources, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan, Hubei, 430074, China |
| |
| Abstract: | Multichannel analysis of surface waves (MASW) method is a non-invasive geophysical technique that uses the dispersive characteristic
of Rayleigh waves to estimate a vertical shear (S)-wave velocity profile. A pseudo-2D S-wave velocity section is constructed
by aligning 1D S-wave velocity profiles at the midpoint of each receiver spread that are contoured using a spatial interpolation
scheme. The horizontal resolution of the section is therefore most influenced by the receiver spread length and the source
interval. Based on the assumption that a dipping-layer model can be regarded as stepped flat layers, high-resolution linear
Radon transform (LRT) has been proposed to image Rayleigh-wave dispersive energy and separate modes of Rayleigh waves from
a multichannel record. With the mode-separation technique, therefore, a dispersion curve that possesses satisfactory accuracy
can be calculated using a pair of consecutive traces within a mode-separated shot gather. In this study, using synthetic models
containing a dipping layer with a slope of 5, 10, 15, 20, or 30 degrees and a real-world example, we assess the ability of
using high-resolution LRT to image and separate fundamental-mode Rayleigh waves from raw surface-wave data and accuracy of
dispersion curves generated by a pair of consecutive traces within a mode-separated shot gather. Results of synthetic and
real-world examples demonstrate that a dipping interface with a slope smaller than 15 degrees can be successfully mapped by
separated fundamental waves using high-resolution LRT. |
| |
| Keywords: | Rayleigh waves pseudo-2D S-wave velocity section high-resolution linear Radon transform mode separation dipping layer |
| 本文献已被 SpringerLink 等数据库收录！ |
|
