https://www.bgs.ac.uk/services/ngdc/accessions/index.html - NGDC Accessions service contains some amount of SEGY format seismic data available under the UK Open Government License.

This repository contains a hardcoded list of dataset IDs which contain .sgy files as of writing (this information isn't searchable via the existing API), and utilities to create downloadable URLs for those files via the Accessions API hosted by the British Geological Survey.

It also features a basicattempt to write data unit tests using segyio to parse the files.

1. https://en.wikipedia.org/wiki/Open_Government_Licence - The OGL permits anyone to copy, publish, distribute, transmit and adapt the licensed work
2. https://www.bgs.ac.uk/services/ngdc/accessions/index.html - National Geoscience Data Centre is recognised as the NERC Environmental Data Centre for geoscience data.
3. https://github.com/equinor/segyio - Segyio is a small LGPL licensed C library for easy interaction with SEG-Y and Seismic Unix formatted seismic data, with language bindings for Python and Matlab