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Rotaphone-CY: The Newest Rotaphone Model Design and Preliminary Results from Performance Tests with Active Seismic

Johana Brokešová¹, Jiří Málek², Jiří Vackář²

¹Department of Geophysics, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 180 00 Prague, Czech Republic.

Sensors (Basel, Switzerland)

|January 20, 2021

Summary

The Rotaphone-CY, a novel six-component seismograph, reliably measures seismic rotations and ground velocity. This advanced instrument shows promising results for seismic data acquisition.

Keywords:

Rotaphone field experiment rotation-to-translation relations rotational seismometer seismic array seismic rotation

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Area of Science:

Geophysics
Seismology
Instrument Development

Background:

Traditional seismographs measure ground velocity, but seismic rotations are also crucial for a complete understanding of seismic wave propagation.
Existing instruments for measuring rotational ground motion are often complex or lack the precision required for short-period events.

Purpose of the Study:

To introduce and evaluate the Rotaphone-CY, a new six-component seismograph designed for co-located measurement of translational and rotational ground motion.
To assess the performance and reliability of the Rotaphone-CY through field testing and data validation.

Main Methods:

The Rotaphone-CY utilizes parallel geophone pairs on a rigid frame to derive differential motions, measuring both ground velocity and rotation rate.
Upgrades include a 32-bit A/D converter, improved geophone placement, and enhanced electromagnetic shielding.
Field testing involved a huddle-testing phase and deployment in a small-aperture seismic array at the Geophysical Observatory in Fürstenfeldbruck.

Main Results:

Preliminary results from an active-source experiment demonstrate the Rotaphone-CY's functionality.
Data validation included inter-instrument comparison, waveform matching, and comparison with array-derived rotations.
The instrument successfully measured short-period seismic rotations down to 10^-7 rad/s.

Conclusions:

The Rotaphone-CY design is promising and shows good functionality for seismic rotation measurements.
The instrument proved to be reliable in field experiments, offering a valuable tool for seismological research.
Further development may enhance its capabilities for various geophysical applications.