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Precision of geodolite distance measurements for determining fault movements (1973)

Savage, J. C. ; Prescott, W. H.

AGU (American Geophysical Union)

In: Journal of Geophysical Research, 78 (26). pp. 6001-6008.

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Publication Date: 2018-09-03

Description: An analysis of the reproducibility of Geodolite measurements at distances ranging from 1 to 35 km indicates a standard deviation for each length measurement of about σ = (a2 + b2L2)1/2, where a = 3 mm, b = 2 × 10−7, and L is the line length. Thus σ ranges from 3 to 8 mm for line lengths of 1 and 37 km, respectively. Corrections for atmospheric refractivity must be determined from temperature and humidity readings made with an aircraft flying along the line of sight at the time of the range measurements in order to attain this precision. Even at this level of precision, determination of the strain accumulation at sites along the San Andreas fault system will require annual observation of many line lengths over a period of at least 5 years.

Type: Article , PeerReviewed

Format: text

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