This file contains the files to reproduce the results presented in the article: by Ivan Koulakov et al. (2024). "Feeding system beneath active volcanoes in central part of Iturup Island (Kuril Arc) inferred from local earthquake tomography", Journal of Volcanology and Geothermal Research. This file includes: 1. The full folder with the LOTOS code for the passive-source seismic tomography (Koulakov, 2009, BSSA). 2. Folder with the dataset including arrival times of the P and S waves from local seismicity in the area of the Iturup Island. 3. README_ITURUP.PDF file with the description of the workflow on how to reproduce the tomography models based on experimental and synthetic data presented in the article. 4. Folder SRF_files with figures from the paper created in Surfer-13 that can be used as templates to visualize the results. Koulakov, I., 2009, LOTOS code for local earthquake tomographic inversion: Benchmarks for testing tomographic algorithms: Bulletin of the Seismological Society of America, v. 99, p. 194–214, https://doi.org/10.1785/0120080013.