The first version of the SurfSeis software (v. 1.0) was released in 2000 for the application of the multichannel analysis of surface waves (MASW) method on seismic data. Developed at the Kansas Geological Survey (KGS), the MASW method consists of four main components. Initially the MASW method was developed for data acquired using active seismic sources, a.k.a. "Active MASW". The same technique was later extended to the application on seismic data from passive sources, "Passive MASW" The next versions of the software - SurfSeis 2, have included new features that take into account new research and methodological developments.

SurfSeis 2 has been prepared mainly to explain the possibilities of using the passive MASW approach, forward dispersion-curve modeling (dispersion-curve values estimations using a 1-D velocity model) and display on dispersion-curve images (a.k.a., Overtone images), and random Monte Carlo inversion on dispersion-curve images. The SurfSeis 2 can serve for both active and passive MASW methods for those who have previous experience in seismic data acquisition and data processing in either body- or surface-wave methods.

Rayleigh-, Scholte-, and Love- waves

Kansas Geological Survey is the birth place of the multichannel analysis of surface waves (MASW) method research efforts originated at the Kansas in the late 80s. It originally focused on analyzing Rayleigh surface waves, which are typically acquired using vertical sources and receivers. Later Scholte waves (aka underwater MASW) and Love-waves were naturally included with appropriate adjustments in the acquisition and analysis.

Four Steps of MASW Process

-          Acquiring multichannel records (or shot gathers),

-          Dispersion-curve imaging and curves estimations (from each record)

-          Inversion of dispersion curves to obtain 1D (depth) Vs profiles for each record

-          Assembling multiple 1D results into 2D or 3D images.

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