852_ani05.mov (14.54 MB)
Supplemental material: Subduction geometry of the Yakutat terrane, southeastern Alaska
journal contributionposted on 2014-11-12, 00:00 authored by Mark A. Bauer, Gary L. Pavlis, Michael Landes
Geosphere, December 2014, v. 10, p. 1161-1176, doi:10.1130/GES00852.1, Animation 5 - This animation compares our regional S-wave data and the tomography data of Eberhart-Phillips et al. (2006). The tomography model is shown in the bottom right frame with positive (slow) velocity anomalies in red and negative (fast) anomalies in blue. Our regional S-wave solution at the identical positions is shown in the top left frame. The depth slices are seen as viewed from the south looking toward the north. The animation is a continuous slicing through both image volumes with the location of the slice shown as a red line on the map on the left. Seismic station locations are shown as magenta spheres north of the section line and orange sound of the section line as it passes. In the sections the orange stations are masked to keep them from obscuring the section plane. Earthquake hypocenters within the yellow boundary around the red line that indicates the slice location are shown as white spheres. The upper white wireframe mesh shows our three-dimensional model for the top of the subducting slab. Immediately below that surface we display our subducting plate Moho surface in black. We also show a rough measure of the lithosphere-asthenosphere boundary produced by projecting the top of slab surface radially along surface a distance of 70 km along surface-normal vectors. White lines parallel to the Aleutian Trench in the map view indicate 1 m.y. time intervals while red lines indicate 5 m.y. time intervals. All time lines are measured from the location of the time 0 curve at the south end of the map, also in red (see text for how this was defined). The aqua lines within the wire mesh parallel to the direction of plate motion near Prince William Sound indicate bounds on the boundary between the Pacific plate and the Yakutat Block (see text). File size is ~14 MB.