Multi-channel analysis of single-shot surface waves
Abstract
Multichannel analysis of surface wave (MASW) method has been effectively used to determine near-surface shear-wave velocity (Vs) for mapping underground structure. A pseudo two-dimensional (2D) Vs profile can be generated by aligning a series of one-dimensional (1D) Vs models, which are obtained by inversion of dispersion curves. With the increasing urbanization, however, it is restrictive for the implementation of this data-redundant survey in the complex and limited urban environment. When only single-shot surface wave data are available, MASW appears insufficient to reconstruct accurate 2D Vs profile with high horizontal-resolution. We demonstrate that common mid-point (CMP) stacking for common virtual-source (CVS) deconvolution gathers of multichannel and single-shot surface wave data produces accurate dispersion measurements, and enables us to reconstruct 2D Vs structure with high horizontal-resolution. We call this method, multichannel analysis of single-shot surface waves (MASS). Numerical modelling examples and a real-world example indicate the superiority of the novel method in improving the accuracy, as well as horizontal-resolution, of subsurface dispersion measurements, compared with conventional MASW method and CMP cross-correlation (CMPCC) method.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2016
- Bibcode:
- 2016AGUFMNS31A1933C
- Keywords:
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- 0994 Instruments and techniques;
- EXPLORATION GEOPHYSICSDE: 0999 General or miscellaneous;
- EXPLORATION GEOPHYSICSDE: 1835 Hydrogeophysics;
- HYDROLOGY