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| | Abstract | | We developed a passive surface wave method that delineates 2D or 3D near-surface S-wave velocity structure (VS) from ambient noise obtained from dozens of receivers on the surface of the ground. Cableless seismograph that includes CPU, A/D converter, battery and SD card was developed and used for the data acquisition. Each unit includes a GPS clock so that all units can be synchronized over any distance without cables. The dozens of seismographs and geophones record ambient noise with receiver spacings that avoid spatial aliasing. CMP-SPAC method processes ambient noise. First, coherencies were calculated for all pairs of receivers. Next, coherencies having CMP were grouped together and a dispersion curve was calculated at each CMP. One-dimensional inversion with spatial constraint estimates 2D or 3D VSmodel. This paper summarizes outline of the method, numerical and field examples. |
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