[1] Univ Trieste, Dept Geosci, I-34127 Trieste, Italy
[2] Aichi Inst Technol, Disaster Prevent Res Ctr, Aichi 4700392, Japan
[3] Bulgarian Acad Sci, Earthquake Engn Dept, Natl Inst Geophys Geodesy & Geog, BU-1113 Sofia, Bulgaria
[4] Univ Kentucky, Kentucky Geol Survey, Lexington, KY 40506 USA
[5] Univ Chile, Dept Civil Engn, Santiago, Chile