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Figure 3.

Volcanic rocks younger than 10 Ma superimposed above sublithospheric low-velocity surface of Wagner et al. (2010). Yellow lines are isochrons for rhyolite volcanism along the Yellowstone–Snake River Plain (YSRP) and High Lava Plains (HLP). Red triangles are Holocene volcanoes of the high Cascades; yellow triangles are areas of Quaternary volcanism in the Cascadia backarc region largely corresponding with seismic low-velocity channels of plume-modified mantle flow; channel axes approximated by gray arrows. Modified from Camp (2019).

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