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README.md

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 [![Language](https://img.shields.io/badge/-Fortran-734f96?logo=fortran&logoColor=white)](https://github.com/topics/fortran)
 [![License](https://img.shields.io/github/license/xumi1993/seispy)]()
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 This is an innovative package for **Surf**ace wave **A**djoint **T**ravel-time **T**omography driven by modern fortran with highlights:
 
 - Calculation of surface wave travel time based on **Eikonal equation** with fast sweeping method ([Tong, 2021a](https://doi.org/10.1029/2021JB021818))
 - Computation of sensitivity kernels through **adjoint method** ([Tong, 2021b](https://doi.org/10.1029/2021JB022365))
 - **Multi-grid model parametrization** utilization in optimization ([Tong et al., 2019](https://doi.org/10.1093/gji/ggz151))
 - Consideration of **surface topography** ([Hao et al., 2024a](https://doi.org/10.1029/2023JB027454))
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+## Gallery
+### Travel time field and sensitivity kernel on curved surface
+![jgrb56585-fig-0001-m](https://github.com/xumi1993/SurfATT-iso/assets/7437523/49e205a3-7529-4079-a8c2-471c6e7075fc)
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+### Tomographic results of S-wave velocity beneath Hawaii Island
 ![Fig2](https://github.com/xumi1993/SurfATT-iso/assets/7437523/f9a0155b-7b83-4970-914d-f13dc42b11e5)
 
 ## Installation