schmandt and humphreys, 2011

Outstanding questions, controversial interpretations, and enigmatic observations: A seismic perspective

Schmandt and Humphreys, 2011

- Tomographic velocity models - Upper mantle discontinuity structure - Anisotropic structure of lithosphere

Seismic tomography models from USArray (and other) data

Becker, 2012; see alsoPavlis et al., 2012

Berkeley model Oregon model ASU/Carnegie model

Seismic tomography models from USArray (and other) data

Becker, 2012Berkeley model Oregon model ASU/Carnegie model

Seismic tomography models from USArray (and other) data

Becker, 2012

Models for W. US are similar, but amplitudes different

Seismic tomography models from USArray (and other) data

Schmandt and Humphreys, 2011

Seismic tomography models from USArray (and other) data

Obrebski et al., 2011

Seismic tomography models from USArray data: surface wave/ambient noise models

Wagner et al., 2012

Combining seismic tomography & MT

Kelbert et al., 2012

Seismic tomography models: looking ahead

Burdick et al., 2012

Seismic discontinuity structure of the lithosphere

Abt et al., 2010

Seismic discontinuity structure of the lithosphere

Lekic et al., 2011

Seismic anisotropy of the lithosphere: a relic of past deformation processes

Yuan et al., 2011

Seismic anisotropy of the lithosphere: a relic of past deformation processes?

Wagner et al., 2012

Summary• Seismic tomography models derived from USArray data in the

western US show a remarkable degree of robust, well-resolved heterogeneity on small spatial scales.

• The interpretation of many of the features in tomography models is still open to exploration/debate.

• Resistivity models obtained from the MT TA can provide constraints complementary to those obtained from seismic velocity models; joint interpretation can shed light on physical processes in crust and upper mantle.

• Several new and exciting results relating to the discontinuity structure of the North American lithosphere.• Nature of LAB? Is the asthenosphere wet/partially melted?• Nature of MLD?

• Anisotropic structure of lithosphere reflects past episodes of deformation. To what extent are these structures reflected in resistivity structure?