A major earthquake struck off the Pacific coast of Guatemala Wednesday morning, rocking the capital and shaking buildings as far away as Mexico City and El Salvador.
Wave Propagation and Tectonic Setting (mpeg-4 8.49 MB / YouTube)
USArray Ground Motion Visualization (mpeg-4 7.22 MB / More Info)
Back Projection (mpeg-4 62.6 kB / More Info)
Focal Mechanisms Explained (mpeg-4 41.0 MB / YouTube)