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Bulletin of the Seismological Society of America; June 1969; v. 59; no. 3; p. 1239-1245
© 1969 Seismological Society of America
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A gyroscopic seismometer: Measurements during the borrego earthquake

W. E. FARRELL

INSTITUTE OF GEOPHYSICS AND PLANETARY PHYSICS UNIVERSITY OF CALIFORNIA,, SAN DIEGO

Abstract

The gyro seismometer, consisting of two counter-rotating pendulous Nordsieck gyroscopes, permits separation of tilts from horizontal motion. Sensitivity is limited by the accuracy with which the gyro orientation can be measured, ~1 arcsecond rms in a 0.5 Hz bandwidth. This instrumental noise level is equivalent to ground tilts of ~1 arcsecond and ground velocities of ~0.1 cm/sec. Peak values in the instrumental pass band (0 to 0.5 Hz) of the tilt and horizontal velocity during the Borrego Mountain, California, earthquake of April 9, 1968, were 1 cm/sec and 10 arcseconds respectively. In La Jolla, 115 km from the epicenter, the static displacement and tilt were less than 1 cm and 0.1 arcsecond (5 x 10–7 radian).




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