Offset And Resolution Of Dispersion Curve In Multichannel Analysis Of Surface Waves (Masw)

Abstract

Influence of offset-related parameters on the resolution of dispersion curve in multichannel<br>analysis of surface waves (MASW) surveys is described from the theoretical perspective of the<br>dispersion curve imaging method used during a normal implementation of MASW. The examined<br>parameters include total number of channels (or traces), closest-to-source offset, receiver spacing, and<br>total length of the receiver spread. The influences of different phase velocities and frequencies are also<br>briefly described. It is shown that a larger total receiver spread length is always preferred to produce a<br>higher resolution. This means that with a given number of channels available a greater receiver spacing<br>is preferred as long as it does not cause a spatial aliasing problem. This shows that with MASW method<br>the general notion that more channels are always better can be misleading.