Anisotropy map Seismic Anisotropy Map of Western U.S. click in figure or here to enlarge Figure 1. Shear wave splitting results from 26 stations plotted on western U.S. elevation map. Red bars indicate fast direction in the upper layer where resolved from the waveform data. Dashed bars are used to indicate unconstrained measurements based on 3 or fewer records. At station ORV, a cross sign is used to indicate absence of splitting.
Queries indicate regions where knowledge of the boundaries is poor.