Research Themes

Raj works on planetary-scale geophysical problems using new techniques that reconcile and fit concurrently a wide variety of seismological observations. His doctoral work has resulted in the next-generation three-dimensional images of the Earth’s interior, similar to a CT-scan for the human body. Recent progress includes evaluating the extent of radial anisotropy with implications for large-scale mantle flow, detecting seismological signatures of chemical heterogeneity from scaling relationships between the elastic parameters and density, as well as radial models that represent accurately the Earth’s spherically averaged properties. He works with several collaborators to infer the modeled properties in terms of the dynamics and evolution of the Earth's interior.

Earth's Composition Is there a chemically distinct reservoir in the Earth?

Do superplumes overly denser-than-average material?

Can we detect these anomalies?
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Flow in the Mantle Nature of flow in the mantle?

How fast do waves travel anywhere on Earth?

Where can radial anisotropy be robustly detected?
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Reference Earth Models What does the Earth look like on average?

Historical discrepancies in 1-D Reference Earth Models?

.... and several other interesting questions.
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