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P Velocity Perturbations<br />
124˚W 120˚W 116˚W 112˚W 108˚W<br />
NWUS11b_P<br />
Depth = 200 km<br />
Mantle<br />
Tomography<br />
• 48˚N 48˚N<br />
Apparent gap in Juan<br />
de Fuca slab<br />
(inversion artifact)<br />
44˚N<br />
40˚N<br />
44˚N<br />
40˚N<br />
• High velocities<br />
beneath cratonic<br />
North America<br />
• Low velocities<br />
beneath central<br />
Oregon and SRP/Y<br />
36˚N<br />
36˚N<br />
-1.5 -1.0 -0.5 0.0 0.5 1.0 1.5<br />
Velocity Perturbation (%)<br />
• Central Nevada<br />
anomaly<br />
Roth et al., GRL, 2008;<br />
James et al., submitted to EPSL, 2011
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