Encyclopedic Dictionary of Applied Geophysics, fourth edition

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Series Investigations in Geophysics, No. 13
Author Robert Sheriff
DOI http://dx.doi.org/10.1190/1.9781560802969
ISBN ISBN 978-1-56080-118-4
Store SEG Online Store

The fourth edition of SEG's bestseller is now available in its entirety on the wiki - for free. This is a valuable, comprehensive reference that is a must for every geophysicist, geologist, explorationist, engineer, energy adviser, economist, and student involved in the field. In the printed form of the book, a CD containing the dictionary in searchable PDF format also is included.

A A (ampere) B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Common editing tasks

Since Robert Sheriff conceptualized a written book when completing his work, there are three common issues that detract from the full online experience. These issues arise in:

  1. equations
  2. references
  3. figures


Most of the equations in the Dictionary are poorly formatted. This is due to the initial conversion process from book to wiki.

If you know LaTeX, or are willing to learn, you can help us fix the equations. CodeCogs, a visual website that allows you to create the math code you need, can be used to fix or prepare equations.

This article provides numerous examples of the proper math code. Visit this page for a list of articles needing improvement.


Just like technical papers, wikis need citations and references if they are to be useful and trusted. Frequently, references will appear in the articles without proper citations. This is the full list of references that appear in the Dictionary. Use this page to locate the missing full citations in the Dictionary articles.

The Q article has been fixed. Here are two more that need to be fixed: anisotropy and tomography.

Note: References are more difficult to find since there is not a category listing all of the pages that need references. Many of the articles, including Dictionary figures, will need to have references added.


As with references, most of the figures do not appear in their entirely on the article. All of the figures for Sheriff’s Dictionary have captions. We will retain the captions when adding the figures to the Dictionary entries.

It is possible that these figures will have the same issues as the dictionary entries: improper math and no references. I encourage you to address these issues in the figures as you see them.

The Q article shows one way to integrate them. Some articles have lots of figures. The tomography article needs fixed.