Due to its topography and geological history, Norway is subject to high landslide hazard. On the 20th of June, 1996, a submarine land failure near the village of Finneidfjord (Mid-Norway) developed into a retrogressive quick clay slide. 4 people lost their lives. Due to this incidence, the area has been location for several geophysical investigations. During the last one, in the summer of 2007, the International Centre for Geohazards (ICG, Oslo) collected ground penetrating radar, resistivity measurements and seismic data. Analysis of seismic surface waves has received increasing attention from different geophysical communities lately. This assignment, done in collaboration with ICG, is focusing on analysis of the Finneidfjord data with a method called multichannel analysis of surface waves, or MASW. The final objective of this method is to obtain a shear-wave velocity profile with depth. Calculation of a phase velocity versus frequency plot, known as a dispersion image, and velocity inversion are key operations in this method. A visit to Bureau de Recherches Géologiques et Minières (BRGM, Orléans, France) was a part of this thesis work to get training in software and new developments of the MASW technique. Dispersion properties of surface waves are first introduced, then the MASW method is explained and both advantages and limitations discussed. In the end this method is applied to the seismic data collected in the Finneidfjord area in the summer of 2007. The other geophysical data are also presented together with a geological interpretation. Different parts of the investigation area hold separate geological properties and no clear evidence for quick clay is found.