Mara Figueroa, Instituto Geofísico Sismológico Ing. Volponi, San Juan, Argentina, Demian Gomez, Ohio State University, Columbus, OH, United States, Robert Smalley Jr, University of Memphis, Center for Earthquake Research and Information, Memphis, TN, United States, Michael G Bevis, Ohio State University Main Campus, Columbus, OH, United States, Patricia M Alvarado, CIGEOBIO (CONICET, Universidad Nacional de San Juan), Departamento de Geofísica y Astronomía, FCEFN, San Juan, Argentina and Hugo Baigorri, Instituto Nacional de Prevención Sísmica, San Juan, Argentina