Abstract
We have developed a number of instruments that are capable of measuring vibrations at very low frequencies (below 1 Hz). Two of these instruments are a laser strainmeter, which can respond to strains with frequencies ranging from 0 to about 100 Hz and a borehole tiltmeter which can respond to deflections of the vertical or horizontal accelerations in the frequency range from 0 to about 1 Hz. We have also modified commercial gravity meters (vertical accelerometers) and have used them to make measurements at comparable frequencies. Most of our work has been motivated by geophysical considerations including the dynamics of the earth in seismically active regions, but the instrumentation might also be useful in vibration monitoring for other purposes.
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