The frequency response of the instrument is determined by the network characteristics of the force-feedback design. Introduction The electronics of conventional seismic instruments is a type for which the sensitivity falls off at 20 dB per decade for frequencies below approximately 10 mHz. More recent studies suggest that many tilt-sensitive seismic instruments are capable of observing these oscillations-if the low-frequency response of their electronics is not suppressed, as is customary with most conventional designs. Later tiltmeter studies demonstrated the usefulness of autocorrelation for the routine study of these normally short-lived eigenmodes. Peters Department of Physics Mercer University 1400 Coleman Ave Macon, Georgia 31207 Abstract The nearly-incessant free oscillations of the Earth (not the larger, long-lived normal modes seen following intense quakes) were first observed by accident in the record of a tilt-sensitive instrument designed to study surface physics. Folded Pendulum Measurements of Earth's Free Oscillations physics.geo-ph Folded Pendulum Measurements of Earth's Free Oscillations Randall D.
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