EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

A Low Noise Model for Rotational Ground Motions

Heiner Igel1, Andreas Brotzer1, Eleonore Stutzmann2, Jean-Paul Montagner2, Chin-Jen Lin3, Celine Hadziioannou4, Joachim Wassermann1, and Ulrich Schreiber5
Heiner Igel et al.
  • 1LMU Munich, Earth an Environmental Sciences, Munich, Germany (
  • 2Institut de Physique du Globe, Paris, France
  • 3Academia Sinica, Taipei City, Taiwan
  • 4Institute of Geophysics, University of Hamburg, Germany
  • 5Fundamentalstation Wettzell, Germany

The quantitative low/high noise models (L/HNM) for translational ground motions (e.g., Petersen 1993) based on many observations of acceleration power-spectral densities has been extremely successful for the evaluation of site quality, as well as the development of seismic sensors for passive experiments on Earth. No such L/HNM exists for rotational ground motions, primarily because 1) there are close to no direct sensors that measure below the Earth’s smallest rotational motions (large ring laser are currently the most sensitive instruments), and 2) small-scale seismic arrays can be used to derive rotational motions, but are limited in frequency range. A (even approximate) rotational L/HNM would be useful in particular for the development of new rotation sensors considering the numerous possible applications of 6 degree-of-freedom observations in terrestrial and planetary seismology as well as ocean bottom observations. As the terrestrial low-noise motion is primarily dominated by surface waves, the well-known connection between plane surface waves and rotational motions can be used to estimate rotational motions from classic seismometer records using local velocity information. We propose a methodology to derive a rotational L/HNM and support the model by ring laser and seismic array observations.

How to cite: Igel, H., Brotzer, A., Stutzmann, E., Montagner, J.-P., Lin, C.-J., Hadziioannou, C., Wassermann, J., and Schreiber, U.: A Low Noise Model for Rotational Ground Motions, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-3112,, 2022.