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GEOREF RECORD

Finding the mean and 95 percent confidence interval of a set of strike-and-dip or lineation data

Abstract

Quantitative observational data should be reported with appropriate uncertainty estimates. Statistical methods developed by Fisher (1953) to analyze paleomagnetic data are also useful for determining the 95 percent confidence interval associated with site mean strike and dip from three or more observations (at least seven observations preferred) of the orientation of geologic surfaces that are approximately homoclinal or of lineations that are subparallel. The uncertainty in the strike of a surface is a function of the uncertainty and inclination of the dip vector and is greater than the dip uncertainty. For example, surfaces with measured orientations (strike and dip) of 310 degrees 38 degrees NE, 319 degrees 45 degrees NE, and 322 degrees 30 degrees NE at a given site have a site mean orientation of 317+ or -18 degrees and 38+ or -14 degrees NE at a 95 percent confidence interval.


ISSN: 1078-7275
EISSN: 1558-9161
Coden: ENGEA9
Serial Title: Environmental & Engineering Geoscience
Serial Volume: 14
Serial Issue: 2
Title: Finding the mean and 95 percent confidence interval of a set of strike-and-dip or lineation data
Author(s): Cronin, Vincent S.
Affiliation: Baylor University, Department of Geology, Waco, TX, United States
Pages: 113-119
Published: 200805
Text Language: English
Publisher: Association of Engineering Geologists and the Geological Society of America, College Station, TX, United States
References: 11
Accession Number: 2008-110265
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Abstract, Copyright, Association of Engineering Geologists and the Geological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200840
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