SEG Wiki Terms of Use

The SEG Wiki content is collaboratively developed by SEG Members using MediaWiki software. Only SEG Members who are signed in may contribute to its content. However, the content of the SEG Wiki, except as may be noted otherwise within it, is available to the public without access controls and is available for reuse by anyone under the Creative Commons Attribution-ShareAlike 3.0 Unported License (CC-BY-SA).

This means the content can be copied, modified, and redistributed, including for commercial use, as long as the new version grants the same freedoms to others and acknowledges the authors of SEG Wiki entries (a link to the entry satisfies author-credit requirements). By adopting this copyleft policy for the SEG Wiki, SEG aims to foster growth of this technical information exchange mechanism designed to accelerate the pace of innovation in applied geophysics and related fields.

The SEG Wiki includes the contents of the Encyclopedic Dictionary of Applied Geophysics, fourth edition, by Robert E. Sheriff, and while retaining copyright to this work, SEG licenses it under the CC-BY-SA license except for portions credited to non-SEG sources. Those seeking to reuse these portions must contact the copyright holder for permission. SEG and the SEG Wiki's editors and contributors own copyright (automatically with respect to editor and contributor contributions under the Berne Convention) to most of the wiki's content.


By submitting content to the SEG Wiki, contributors agree to license their submissions to SEG and the public under the CC-BY-SA license and other terms specified by SEG. Please see the CC-BY-SA license deed ( and the Legal Code that it summarizes ( Wikipedia also uses this license, enabling exchange between Wikipedia and the SEG Wiki provided that license requirements are followed.

In order to contribute to the SEG Wiki, you must be in a position to grant this license. This means

  • you own copyright in the material, for instance because you produced it yourself, or
  • you acquired the material from a source that allows licensing under CC-BY-SA

Additionally, you may submit material to the SEG Wiki if

  • your use of works copyrighted by others adheres to legal standards for fair use, or
  • the material is in the public domain (i.e., not owned by any entity)

Regarding material you own: You retain copyright to your materials. You can later republish and relicense them in any way you like. However, you cannot retract the CC-BY-SA license for versions placed in the SEG Wiki.

Regarding material from a source that licenses it under CC-BY-SA: It is required that you acknowledge the authorship and provide a link to the original copy if it is available online. (For example, if a Wikipedia entry is reused in an SEG Wiki entry, a link to the Wikipedia entry is required along with acknowledgment that it is released under the CC-BY-SA license, and the contributors must be acknowledged.) Do not link to a site that violates copyright by distributing someone else's work without license. If you obtain permission to use a copyrighted work under CC-BY-SA directly from the copyright holder, you must make note of that fact and provide within your SEG Wiki entry the name of the copyright holder and the date permission was obtained.

Regarding material used under fair use: You are required to cite the source and are encouraged to link to an official version if feasible in the context of your contribution.

Your identity will be associated with every page you contribute to the SEG Wiki. Please see SEG Wiki Privacy Policy for more information.

SEG-specific terms

Contributors of content to the SEG Wiki warrant to the Society of Exploration Geophysicists, its heirs, successors, and assigns, that

• they are authorized to license the work they submit and that they have secured necessary permissions and/or licenses and have provided appropriate and required attribution if contributing work of others.

• they agree to and have adhered to all terms of Ethical Guidelines for SEG Publications ( that reasonably could apply to the SEG Wiki.

These SEG-specific terms strengthen ethical and legal requirements for content submission. Contributors who are unwilling or unable to abide by terms of the CC-BY-SA license and the SEG-specific terms should not contribute material to the SEG Wiki.

Linking to SEG materials

SEG strongly encourages SEG Wiki contributors to provide links to official versions of SEG publications, professional development offerings, and other materials. Linking to the official SEG source and acknowledgment of SEG copyright is required if an image or other media file from an SEG source is included in an SEG Wiki entry. Placing the contents of SEG-copyrighted material in the SEG Wiki is not permitted, even if you are the author, without permission in writing from SEG, except as may be allowed under SEG permissions policy (/resources/publications/permissions). SEG does not offer CC-BY-SA license to its copyrighted material except for the Encyclopedic Dictionary of Applied Geophysics, fourth edition. Your work published in non-SEG publications may carry restrictions on reuse similar to those SEG imposes with respect to its own publications; please check with the publisher and/or copyright owner if you are not certain.

Images and other media

It is preferred that images and other media used in SEG Wiki entries be licensed under CC-BY-SA or a similar or compatible "free" license. Other images and media files may be used only under fair-use provisions of copyright law. Because some images and other media used in the SEG Wiki might fit in this category, image-description pages must contain information indicating their legal status. Images and other media without such information in description pages will be deleted. Anyone wishing to reuse images and other media appearing in the SEG Wiki is advised to examine the legal status of these elements and seek permissions as may be required by the copyright holder.

Copyright violations

Violators of submissions requirements will be appropriately warned, and submissions in violation of licenses and policies here identified and described will be removed. Repeat violators will be blocked from contributing to the SEG Wiki.

If you detect possible copyright infringement in the SEG Wiki, please make note of it in the potentially problematic page's discussion page. It is possible that material published elsewhere may legally be posted to the SEG Wiki, and a discussion could shed light on the reality. If you think the situation requires more direct intervention from SEG, please do not hesitate to contact SEG Wiki administrators.

Representations, warranties, disclaimer, and limitation on liability

Please see the Legal Code for the Creative Commons Attribution-ShareAlike 3.0 Unported license.

Additional resources

In most respects, the SEG Wiki follows an approach to copyright, licensing, and content reuse embraced by Wikipedia. Wikipedia has several helpful pages on navigating the "free" intellectual property landscape in a wiki environment. SEG encourages SEG Wiki users in need of further guidance to avail themselves of these resources and others offered by Creative Commons.