Map of the Aleutian Arc in Alaska and the Andreanof study area. The lower map shows where ocean-bottom seismometers and land seismic stations recorded sound waves from an active-source seismic experiment conducted aboard the R/V _Marcus G. Langseth_ , allowing the authors to image the deep structure of the arc crust beneath several Aleutian volcanoes. The black lines show the _Langseth_ ship track and the yellow line shows the location of the crustal velocity profile. Credit: Mark et al. [2026], Figure 1
A Snapshot of Continental Crust in the Making
