TomoDD
Type: Local earthquake double-difference travel-time tomography
Download software:
https://cuseistut.readthedocs.io/en/latest/_downloads/bddb170e1a6c5e0e4c9dea36044d36cc/USTC-tomoDD-SE-training2020.tarTutorial:
https://cuseistut.readthedocs.io/en/latest/body_tomo/index.html
Description:
TomoDD performs joint inversion of 3-D seismic velocity structure (Vp, optionally Vs) and relocated earthquake hypocenters using both absolute and differential travel times. By minimizing common ray-path effects, it significantly improves relative earthquake locations and resolves fine-scale crustal heterogeneity. It is particularly effective for dense local networks and active fault or volcanic regions.
LOTOS
Type: Local to regional earthquake travel-time tomography
Tutorial:
https://www.mooc-list.com/instructor/ivan-koulakovData, programs and examples: https://zenodo.org/search?q=Ivan%20Koulakov&l=list&p=1&s=10&sort=bestmatch
Linux version and example: https://zenodo.org/records/15788499
Description:
LOTOS is a flexible tomography package for imaging Vp, Vs, and Vp/Vs structures using local earthquake data. It supports iterative inversions with adaptive gridding and allows strong user control over parameterization and damping. The code is widely applied in subduction zones, collision belts, and rift systems, making it well suited for complex tectonic environments.
SIMULPS (and related software)
Type: Classical local earthquake tomography
Data, programs and examples:
https://zenodo.org/records/10695070
Description:
SIMULPS simultaneously inverts for seismic velocity structure (Vp, Vs) and earthquake hypocenter parameters using ray-theoretical travel times. It is a well-established and robust framework with strong emphasis on resolution tests (e.g., checkerboard and spike tests). The method is commonly used for crustal-scale studies with small to medium seismic networks.
FMtomo
Type: Finite-frequency seismic tomography
Description:
FMtomo implements finite-frequency (banana–doughnut kernel) tomography, accounting for wavefront healing and frequency-dependent sensitivity that are neglected in ray theory. This approach improves recovery of smooth, large-scale velocity anomalies, particularly in the lithosphere and upper mantle. It is well suited for regional to continental-scale imaging.
TomoATT
Type: Anisotropic seismic travel-time tomography
Code and documentation:
https://tomoatt.com/
Description:
TomoATT allows joint inversion of isotropic velocity structure and seismic anisotropy, resolving direction-dependent wave speeds related to mineral alignment, strain, and mantle flow. The method is especially powerful in regions with good azimuthal ray coverage and is commonly applied to subduction systems and deforming lithosphere.