Premium
Mantle flow at a slab edge: Seismic anisotropy in the Kamchatka Region
Author(s) -
Peyton Valerie,
Levin Vadim,
Park Jeffrey,
Brandon Mark,
Lees Jonathan,
Gordeev Evgenii,
Ozerov Alexei
Publication year - 2001
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2000gl012200
Subject(s) - geology , subduction , slab , trench , seismology , slab window , mantle (geology) , peninsula , pacific plate , mantle wedge , shear (geology) , geophysics , oceanic crust , petrology , tectonics , history , chemistry , organic chemistry , archaeology , layer (electronics)
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.