Mantle flow at a slab edge: Seismic anisotropy in the Kamchatka region

The junction of the Aleutian Island and the Kamchatka peninsula defines a sharp turn in the boundary of the Pacific and North American plates, terminating the subduction zones of the northwest Pacific. The regional pattern of shear-wave birefringence near the junction indicates that trench-parallel...

Full description

Bibliographic Details
Main Authors: Peyton, V., Levin, V., Park, J., Brandon, M., Lees, J., Gordeev, E., Ozerov, A.
Other Authors: College of Arts and Sciences, Department of Geological Sciences
Format: Article in Journal/Newspaper
Language:English
Published: American Geophysical Union 2001
Subjects:
Russian Federation
seismic anisotropy
plate boundary
Slab edge
mantle process
Shear wave birefringence
Pacific
Kamchatka Peninsula
Aleutian Island
Kamchatka
Online Access:https://doi.org/10.17615/y2xd-0t12
https://cdr.lib.unc.edu/downloads/02871592v?file=thumbnail
https://cdr.lib.unc.edu/downloads/02871592v
Description
Summary:The junction of the Aleutian Island and the Kamchatka peninsula defines a sharp turn in the boundary of the Pacific and North American plates, terminating the subduction zones of the northwest Pacific. The regional pattern of shear-wave birefringence near the junction indicates that trench-parallel strain follows the seismogenic Benioff zone, but rotates to trench-normal beyond the slab edge. Asthenospheric mantle is inferred to flow around and beneath the disrupted slab edge, and may influence the shallowing dip of the Benioff zone at the Aleutian junction.

Similar Items