Institution: | (1) Geological and Environmental Sciences, Stanford University, Stanford, California, 94305-2220;(2) Department of Mathematics, Katholieke Universiteit Leuven, Celestijnenlaan 200B, 3001 Heverlee, Belgium;(3) Department of Civil Engineering, The University of Calgary, 2500 University Drive N.W., Calgary, AB, T2N 1N4, Canada |