ABSTRACT
The relatively straightforward approach of using surfaces to represent the third dimension, rather than to create a true 3-dimensional volume with cubes or voxels that contain x, y, z, and attribute information, makes the computational aspects of the model simpler. Five principal geological/geophysical data sets were combined with a digital elevation model and used to construct 3-dimensional models: migrated seismic reflection profiles; seismic refraction data; gravity models; magnetic models; and a bedrock geological map. The United States Geological Survey with the cooperation of the Geological Survey of Canada is constructing a digital geological/geophysical transect which is part of the Global Geoscience Transect Project of the International Commission on the Lithosphere. One of the best-defined interfaces seen in our data is the MOHO. This boundary was well imaged by both the high angle seismic reflection survey and by the wide angle reflection data from the refraction experiment.
