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Adaptation of the S-5-S pendulum seismometer for measurement of rotational ground motion

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Abstract

The Russian electrodynamic seismometer model S-5-S has been adapted for the measurement of rotational ground motion. The mechanical system of the original S-5-S seismometer consists of electrodynamic sensing and damping transducer coils mounted on an asymmetrical double-arm pendulum. This pendulum is suspended on a footing using two pairs of crossed flat springs, which operate as the axis of rotation. The pendulum is stabilised by an additional spring. The S-5-S can be used either as a vertical or as a horizontal sensor. The adaptation of the S-5-S seismometer described below involves removal of the additional spring and installation of an additional mass on the damping arm. Strain gauge angle sensors are installed on one pair of the crossed flat springs. The main dynamic parameters of the rotational seismometer created in this way, i.e. the natural period and damping, are controlled electronically by feedback currents proportional to the angular displacement and angular velocity, both fed to the damping transducer coil. This new seismometer, named the S-5-SR, enables measurement of the rotational component of ground motion around the horizontal or the vertical axes. The output signal from this S-5-SR seismometer can be proportional either to rotational displacement or rotational velocity.

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Acknowledgements

This research was carried out with the financial support of the Research Programme of the AS CR “Study of selected physical fields and their manifestations in rock massif and observatory activity”, OZ 30860518.

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Authors and Affiliations

  1. Institute of Geonics, Academy of Sciences of the Czech Republic, Studentská 1768, Ostrava, 70800, Czech Republic

    Jaromír Knejzlík, Zdeněk Kaláb & Zdeněk Rambouský

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  1. Jaromír Knejzlík
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  2. Zdeněk Kaláb
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  3. Zdeněk Rambouský
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Correspondence to Jaromír Knejzlík.

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Knejzlík, J., Kaláb, Z. & Rambouský, Z. Adaptation of the S-5-S pendulum seismometer for measurement of rotational ground motion. J Seismol 16, 649–656 (2012). https://doi.org/10.1007/s10950-012-9279-6

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  • DOI: https://doi.org/10.1007/s10950-012-9279-6

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