Supplemental material: Plate margin deformation and active tectonics along the northern edge of the Yakutat Terrane in the Saint Elias Orogen, Alaska, and Yukon, Canada
journal contributionposted on 2012-11-16, 00:00 authored by Ronald L. Bruhn, Jeanne Sauber, Michelle M. Cotton, Terry L. Pavlis, Evan Burgess, Natalia Ruppert, Richard R. Forster
Geosphere, December 2012, v. 8, p. 1384-1407, doi:10.1130/GES00807.1, Supplemental Figure 1 - PDF file of supplement for Figure 6. Oblique view of the Fairweather fault where it lies beneath the trough of the Valerie Glacier. The figure illustrates the contractional bend in the fault trace where there is a “pop-up” ridge between 970 m and 1827 m. Note also that the active trace of the fault is located along the southern margin of the glacier valley, a common characteristic of large strike-slip fault zones. The fault terminates beneath the upper Seward Glacier in a northwest trending splay fault that we interpret to be partly extensional. The Cascade Glacier thrust may also be partly reactivated by enhanced contractional strain on the opposite side of the Fairweather termination, acting to partially close the outlet valley to the lower Seward Glacier, which feeds the Malaspina Glacier on the piedmont.