S-wave structure of the American Southwest and Mexico from single-station broadband data
Article first published online: 7 DEC 2012
Copyright 1997 by the American Geophysical Union.
Geophysical Research Letters
Volume 24, Issue 23, pages 3053–3056, 1 December 1997
How to Cite
- Issue published online: 7 DEC 2012
- Article first published online: 7 DEC 2012
- Manuscript Accepted: 10 SEP 1997
- Manuscript Received: 12 JUN 1996
We investigate S velocity structure beneath the Southwestern U.S. and Mexico using upper mantle turning S waves and surface waves. The data are tangential component records from Baja California, Mexican and Central American events recorded at broadband station ANMO (Albuquerque, New Mexico). Study geometry allows investigation of the variation of S structure with source-receiver azimuth for sources from Baja to Yucatan. The narrow backazimuthal sector studied comprises a transition from oceanic to tectonic to more ‘continent-like’ structure. We document this transition in the lithosphere and upper mantle to roughly 450 km depth.