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Global Mantle Imaging With the Multi-mode Body Wavefield

Description: 

Seismological imaging has revealed a global mantle transition zone discontinuity, primarily driven by phase transformations in mantle minerals. However, the origins and extent of other recently observed discontinuities—such as the mid-lithosphere discontinuity, low-velocity zones above and below the mantle transition zone, and mid-mantle discontinuities—remain uncertain. Resolving the causes of these features requires joint analysis of multimodal body waves (P and S waves). By combining S and P reflections with conversions, we can potentially mitigate the trade-offs between compositional, thermal, and volatile influences, translating seismic data into detailed rock property profiles. This study outlines a framework for multimodal seismic analysis, integrating SS precursors and P-to-S receiver functions to better characterize the velocity and density gradients that contribute to mantle stratification. We highlight recent technical advancements enhancing Ps-RF and SS-precursor imaging. These include FADER (Fast and Automated Detection and Elimination of Reverberations) and CRISP-RF (Clean Receiver Function Imaging with Sparse Radon Filters) for Ps-RFs, as well as SHARP-SS (Sparse and High-resolution Algorithm for Reflection Profiling using SS waves) for SS-precursors. We demonstrate the effectiveness of this joint imaging approach with case studies from Africa's ancient lithosphere, global oceans, and North America.

Session: Earth’s Structure from the Crust to the Core - IV

Type: Oral

Date: 4/16/2025

Presentation Time: 04:30 PM (local time)

Presenting Author: Tolulope

Student Presenter: No

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