Abstract
Where passive elliptical markers are homogeneously and coaxially strained the strain ellipse ratio may be estimated to within 10%. This takes account of inaccuracies in measurement and does not assume knowledge of the strain ellipse's orientation. Between 50 and 75 markers are needed to achieve this accuracy and larger sample sizes do not significantly improve on this. The de-straining methods use two different tests for randomness of the de-strained fabric. One of these, the runs test, is particularly sensitive to clustering in the angular distribution and may be of particular value in de-straining sedimentary fabrics. De-straining methods are warranted where the strain ellipse ratio is ⩾3.0 in natural data.
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