Figure 4
From: Lateral Variation of Crustal Lg Attenuation in Eastern North America
Lateral variation of Q Lg (left), resolution analysis at 2° × 2°(center), and associated ray-path coverage (right) at 0.5 Hz (a–c), 1.0 Hz (d–f), 3.0 Hz (g–i), and 10.0 Hz (j–l). Note that different color scales are used for the maps. Numbers are associated to the locations of Q anomalies in the tomography results. Major geological provinces are indicated as; Superior (Su), Grenville (Gr), Appalachian (Ap), and Southern (SP). In c, f, and i, the blue lines are single-station paths, whereas the pink lines are two-station paths. The figure is generated from GMT, which is an open source software available at: http://gmt.soest.hawaaii.edu.
