1. Professor, Dept. of Civil and Environmental Engineering and Geodetic Science, The Ohio State Univ., Columbus, OH 43210.
2. Graduate Research Assistant, Dept. of Civil and Environmental Engineering and Geodetic Science, The Ohio State Univ., Columbus, OH 43210.
3. Project Engineer, Ninyo & Moore, San Diego, CA 92123; formerly, Graduate Research Assistant, Univ. of California-Los Angeles.