1. University of California, Los Angeles, Department of Civil & Environmental Engineering, 5731 Boelter Hall, Los Angeles, California, 90095-1593
2. University of Chile, Department of Civil Engineering, Blanco Encalada 2002, Santiago, Chile
3. Universidad Federico Santa María, Departamento de Obras Civiles, Av. España 1680, Valparaíso, Chile
4. Research Structural Engineer, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland, 20899
5. René Lagos & Asociados, Magdalena 140, Santiago, Chile
6. Catholic University of Chile, Department of Civil & Geotechnical Engineering, Av. Vicuña Mackenna 4860, Santiago, Chile
7. University of California, Berkeley, Department of Civil & Environmental Engineering, 775 Davis Hall, Berkeley, California, 94720-1710