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Allen CV
Seismo Lab
Earth & Planetary
UC Berkeley




Cover Fig. Tomographic 3D view of the DNA09 P-wave velocity structure of the mantle beneath the Pacific Northwest (Obrebski et al, this issue). a) is an oblique section through the currently subducting Gorda-Juan de Fuca slab (JdF) that clearly shows the southern edge of the slab beneath the Mendocino Triple Junction (MTJ). b) is a constant depth slice at 800km that illustrates the contrast between dominantly high velocity mantle to the north and slow velocities to the south where the Farallon slab is no longer present. c) is an E-W vertical slice at 46.5°N. 3D blue isosurfaces show strong fast anomalies linked to the Gorda-JdF slab and to possible Farallon fragments (F1-F2). The red isosurface depicts the 3D geometry of a large slow anomaly that extends from beneath the Yellowstone-Snake River Plain (YSRP) hotspot track to the bottom of our model at 1000km depth and that we interpret as a mantle plume. Back to abstract

Obrebski, M., R.M. Allen, M. Xue, S.-H. Hung (2010) Slab-plume interaction beneath the Pacific Northwest, Geophys. Res. Lett. 37, L14305, doi:10.1029/2010GL043489 abstract | reprint

© Richard M Allen