University of Bergen, Department of Mathematics, Joh. Brunsgate 12, Bergen, 5008 Norway ; Princeton University, Civil and Environmental Engineering Department, Engineering Quadrangle, Princeton, NJ 08544 United States
Utrecht University, Department of Earth Sciences, Budapestlaan 4, Utrecht, 3508 Netherlands
University of Bergen, Department of Mathematics, Joh. Brunsgate 12, Bergen, 5008 Norway
Princeton University, Civil and Environmental Engineering Department, Engineering Quadrangle, Princeton, NJ 08544 United States