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Bulletin of the Seismological Society of America; October 1982; v. 72; no. 5; p. 1707-1715
© 1982 Seismological Society of America
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The optical anchor—A geophysical strainmeter

FRAND WYATT, KENT BECKSTROM and JON BERGER

INSTITUTE OF GEOPHYSICS AND PLANETARY PHYSICS SCRIPPS INSTITUTE OF OCEANOGRAPHY UNIVERSITY OF CALIFORNIA, SAN DIEGO, LA JOLLA, CALIFORNIA 92093

Abstract

An instrument has been developed to monitor the horizontal displacement of near-surface monuments, so as to reduce the noise of observatory-based strain measurements. The device measures the shear strain in the upper 24 m of the earth's crust using an equal path length Michelson interferometer. The magnitude of the observations (~50 µm) indicates that such measurements are needed to interpret the records produced by precision strainmeters.




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