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Bulletin of the Seismological Society of America; May 2009; v. 99; no. 2B; p. 1352-1365; DOI: 10.1785/0120080181
© 2009 Seismological Society of America
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The Effects of Tilt on Interferometric Rotation Sensors

N. D. Pham and H. Igel

Geophysics Section, Department of Earth and Environmental Sciences, Ludwig Maximilians Universität, Theresienstrasse 41, D-80333 München, Germany nguyen{at}geophysik.uni-muenchen.de heiner.igel{at}lmu.de

J. Wassermann

Geophysical Observatory, Department of Earth and Environmental Sciences, Ludwig Maximilians Universität, Ludwigshöhe 8, 82256, Fürstenfeldbruck, Germany joachim.wassermann{at}geophysik.uni-muenchen.de

A. Cochard

Ecole et Observatoire des Sciences de la Terre, Institut de Physique du Globe, 5 rue Rene Descartes, F-67084 Strasbourg Cedex, France Alain.Cochard{at}eost.u-strasbg.fr

U. Schreiber

Forschungseinrichtung Satellitengeodäsie, Technical University Munich, Fundamentalstation Wettzell, Sackenriederstrasse 25, D-93444 Kötzting, Germany schreiber{at}wettzell.ifag.de

Ring-laser rotation sensors are contaminated by rotations around horizontal axes (also called tilts) through the vector product between the local normal direction and the vector of the rotation rate composed of Earth’s rotation and local ground rotations. In this study, we investigate theoretically this cross-axis sensitivity and estimate the effects based on magnitude–amplitude relations to be expected for observations of local earthquakes and teleseismic events. We investigate tilt-ring-laser coupling for rotational motions in the P coda of several past earthquakes using tilt motions derived from observed translations. The results show that compared to the corresponding vertical rotation rate tilt-ring-laser coupling is negligible for observations of teleseismic events and for the applicable range of the local magnitude scale.




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