We propose a novel framework for teleseismic traveltime tomography that requires no ray
tracing. The tomographic inverse problem is formulated as an Eikonal equation‐constrained …

In this study we recast surface wave traveltime tomography as an inverse problem
constrained by an eikonal equation and solve it using the efficient adjoint‐state method …

The fast marching method is an essential step in the level set method, widely applied in
seismic tomography. However, there are two key challenges in large-scale seismic …

The original first-order accurate adjoint-state method for first-arrival traveltime tomography
(Leung and Qian, An adjoint state method for 3-D transmission traveltime tomography using …

We compare classical and adjoint‐state first‐arrival tomography approaches in subsurface
model reconstruction, focusing on pre‐salt updates with a circular‐shot ocean bottom node …

TomoATT is an open-source software package, aiming at determining seismic velocity and
azimuthal anisotropy based on adjoint-state traveltime tomography methods. Key features of …