(Right) Fig. 1. Common procedure for MASW surveys for 1-D, 2-D, and 3-D Vs mapping
(Below) Fig. 2. Illustration to describe the procedure for 2-D Vs mapping.
Overall Procedure of MASW Survey
The common procedure for (1-D, 2-D, and 3-D) MASW surveys usually consists of three steps (Fig. 1):
Data Acquisition: Acquiring multichannel field records (commonly called shot gathers in seismic exploration)
Data Analysis (Step 1): Dispersion analysis extracting one dispersion curve from one field record, and
Data Analysis (Step 2): Inversion back-calculating shear- wave velocity (Vs) variation with depth (called 1-D Vs profile) that gives theoretical dispersion curve closest to the measured (extracted) curve (one 1-D Vs profile from each curve).
A 2-D (surface and depth) Vs map is then constructed through an appropriate interpolation scheme (Fig. 2) by placing each 1-D Vs profile at a surface location corresponding to the middle of the receiver line. A more detailed description including optimum parameters can be found in the following links.