Hi Brad, here is the fault block model we discussed last week. It consists of 6 blocks separated by 5 fault surfaces. I made the blocks by intersecting the faults with each other and the model box, and by then assembling the blocks from the resulting subsurfaces into closed surfaces. The model box is about 48kmx49kmx35km. The top of the model box is topography at ca. 250m resolution and lower resolution bathymetry. The relatively high resolution leads to large aspect ratios for some triangles in the assembled blocks. There were problems with the intersection process which have led to some degenerate triangles at boundaries. So the meshes tend to be aesthetically unpleasant. The screenshot shows the resulting geometries. The gzipped file blocks.ts contains all 6 blocks as concatenated gocad format t-surfs. The coordinate system is UTM zone 11, NAD 27. I could also provide all constitutive non-blocked surfaces (model box, topography, faults) as separate files. The blocks are named block1 to block6. Each block ends in the the file with the END keyword. The blocks have parts. Each part is one side of a block. The gzipped file material.ts contains 2 surfaces named basement and seismicity. Basement is the top of crystalline basement in the area and seismicity is the base of the seismogenic crust in southern California. I hope this is useful, Andreas ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Andreas Plesch Harvard University Dep. of Earth and Planetary Sciences 20 Oxford St. Cambridge, MA, 02138 Tel. 1-617-495-0367 Fax.: -7660 http://structure.harvard.edu/~plesch