(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.
(Below) Fig. 2. Illustration to describe the procedure for 2-D Vs mapping.
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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.
Field Procedure for Data Acquisition
Dispersion Analysis
Inversion Analysis