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SurfATT Documentation


This is a package for Surface wave Adjoint Travel-time Tomography .

SurfATT is a package for surface wave travel-time tomography, which is designed to invert surface wave travel-time data for 2D/3D isotropic or azimuthal anisotropic velocity structures with following features:

  • Inversion for isotropic or azimuthal anisotropic media (Hao et al., 2024b, in preparation).

  • Calculation of surface wave travel time based on Eikonal equation with fast sweeping method [Tong, 2021].

  • Computation of isotropic and anisotropic sensitivity kernels through adjoint method [Tong, 2021].

  • Multi-grid model parametrization utilization in optimization [Tong et al., 2019].

  • Consideration of surface topography in forward and adjoint simulation [Hao et al., 2024].

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SurfATT is an innovative package driven by modern Fortran with an embedded MPI parallel framework. It employs a user-friendly format for both input/output file types, including:

  • yaml for input parameter files

  • csv for input/output travel-time data files

  • hdf5 for input/output model files

Furthermore, this package provides optimal cross-platform compatibility; it operates perfectly on both personal computers and High-Performance Computing (HPC) systems.



Ping Tong. Adjoint-state traveltime tomography: eikonal equation-based methods and application to the anza area in southern california. Journal of Geophysical Research: Solid Earth, 126(5):e2021JB021818, 2021. doi:10.1029/2021JB021818.


Ping Tong. Adjoint-state traveltime tomography for azimuthally anisotropic media and insight into the crustal structure of central california near parkfield. Journal of Geophysical Research: Solid Earth, 126(10):e2021JB022365, 2021. doi:10.1029/2021JB022365.


Ping Tong, Dinghui Yang, and Xueyuan Huang. Multiple-grid model parametrization for seismic tomography with application to the San Jacinto fault zone. Geophysical Journal International, 218(1):200–223, 03 2019. doi:10.1093/gji/ggz151.


Shijie Hao, Jing Chen, Mijian Xu, and Ping Tong. Topography-incorporated adjoint-state surface wave traveltime tomography: method and a case study in hawaii. Journal of Geophysical Research: Solid Earth, 129(1):e2023JB027454, 2024. doi:10.1029/2023JB027454.