Abstract
A wide band horizontal accelerometer using a quartz torsional pivot and capacitative position sensing with phase-sensitive detection is described. Devices for magnetic damping of unwanted modes of vibration and internal stabilization of temperature and pressure are discussed in detail. The accelerometer is small enough in size and weight to allow deployment in bore holes. Data from the earth normal mode band and the seismic band are shown. Although horizontal noise due to surface tilting is high for periods greater than 50 s, noise in the seismic band can be reduced by as much as an order of magnitude by digital high-pass filtering. The resulting horizontal signal-to-noise ratio for teleseismic events is comparable to that for the vertical signals.
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