Adjoint-Based Full-Waveform Inversion of 3D Dynamic Earthquake Rupture

Wenqiang Zhang

Eric Dunham group

1) A unified 3D adjoint formulation for nonlinear frictional rupture with efficient gradient computation of high-dimensional fault parameters

2)  A scalable GPU-accelerated discontinuous Galerkin framework for forward and adjoint simulations on complex fault geometries

Suggested reading: Stiernström, V., Almquist, M., & Dunham, E. M. (2024). Adjoint-based inversion for stress and frictional parameters in earthquake modeling. Journal of Computational Physics, 519, 113447. doi.org/10.1016/j.jcp.2024.113447

The Rise and Fall of ENSO in a Warming World: Insights from a Lag-Linear Model

PJ Tuckman

Da Yang group

1) Basic properties of the sun-earth system, & El Nino-Southern Oscillation (ENSO), Earth's largest source of interannual variability 

2) under greenhouse warming, ENSO events first strengthen then weaken, controlled by the different warming timescales of the surface and sub-surface ocean

Suggested reading: TBD

Dike Propagation from High-fidelity Coupled Fracture and Fluid Flow Models

Xinyi Qian

Paul Segall group

1) A physics-based FEM numerical model couples magma flow, crustal deformation, and fracture mechanics to simulate dike propagation from a chamber at depth.

2) dike-tip pressure evolution strongly affects dike propagation speed and its ability to reach the surface, highlighting the importance of near-tip processes for volcanic eruptions.

Suggested reading:Blackstone, L.A. et al. Modeling dike trajectories in a biaxial stress field with coupled magma flow, fracture, and elasticity. Bull Volcanol 86, 52 (2024). doi.org/10.1007/s00445-024-01734-8