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A photogeologic method for determining the direction of horizontal dilation from patterns of en echelon fracturing

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Wendell A. Duffield, and K. Nakamura, 1973, A photogeologic method for determining the direction of horizontal dilation from patterns of en echelon fracturing: Journal of Research of the U.S. Geological Survey, v. 1, iss. 3.

Summary

The direction of horizontal dilation in areas characterized by tensional tectonics can be determined from a statistical study of en echelon patterns of fracturing observed on aerial photographs. Relative, to a north-south dilation, nearly all directions of zones of dextral (right-lateral) en echelon fractures lie in the northeast quadrant, while those of sinistral (left-lateral) en echelon fractures concentrate in thenorthwest quadrant. Statistically, directions of the two types of zones define unimodal frequency curves that intersect at about 90 degrees to,and thus define the direction of, applied dilation. The method has been field tested twice and is believed to be suitable for any areacharacterized by (1) generally unidirectional [...]

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Type Scheme Key
local-index unknown 70160727
local-pk unknown 70160727
series unknown Journal of Research of the U.S. Geological Survey

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journalJournal of Research of the U.S. Geological Survey
parts
typevolume
value1
typeissue
value3
typePublication Place
valueReston, VA
languageEnglish
citationTypeArticle

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