The seismometer based on fiber-optic Mach-Zehnder interferometer is proposed and tested. The sensing element of the seismometer is implemented as a multiturn optical fiber coil which allowed to obtain high responsivity to acceleration in the frequency range 1–20 Hz. Stability of the seismometer operation is provided by feed-back control of the interferometer working point. It is experimentally demonstrated that seismometer is able to reliably detect weak seismic vibration with acceleration amplitude at the level of 10^–7 m/s^2.
$^1$Institute of Automation & Control Processes, Far-Eastern Branch of Russian Academy of Sciences
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