| A common geotechnical problem is the estimation of landslide volumes and geometries. Accurate estimates are vital for mitigation purposes. Geologists commonly use two-dimensional seismic surveys to characterize landslides. Anisotropy, basal slip surface irregularities, and topographic measurements are ignored or assumed negligible.; This thesis presents a method to construct three-dimensional models of landslides from seismic refraction data collected in a grid across a landslide. By placing the survey lines in a grid, the errors within the individual lines become apparent.; The model constructed, using data from a landslide in Blind Canyon, northern Santa Ana Mountains, California, demonstrated that ignoring anisotropy, basal slip surface irregularities, and topographic measurements introduces errors. The interpreted velocities and depths to the basal slip surface varied depending upon the direction of the seismic wave measurement. The slip surface has an irregular geometry. Large errors occurred when terrain corrections were made using a uniform gradient. |
