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Seismological Processing of Six Degree-of-Freedom Ground-Motion Data
David Sollberger1, Heiner Igel2, Cedric Schmelzbach1
1Institute of Geophysics, ETH Zürich, 8092 Zürich, Switzerland.
Sensors (Basel, Switzerland)
|December 8, 2020
Summary
New rotational sensors enable direct measurement of seismic ground motion, offering six degrees of freedom (6DOF) data. This advancement promises to revolutionize seismology by providing richer data for wave analysis and inverse problems.
Area of Science:
- Geophysics
- Seismology
Background:
- Recent advancements in rotational sensor technology allow direct measurement of ground motion from seismic waves.
- Combining rotational and inertial seismometer data provides six degrees of freedom (6DOF) ground-motion observations.
Purpose of the Study:
- To introduce the field of 6DOF seismology to a broader seismological audience.
- To summarize recent progress and highlight the value of rotational ground-motion data.
Main Methods:
- Utilizing multicomponent ring laser observatory data for a teleseismic earthquake.
- Applying single-station 6DOF processing tools for automated wave parameter estimation.
Main Results:
- Demonstrated the first 6DOF processing of a teleseismic earthquake.
- Successfully estimated wave parameters (phase velocity, propagation direction, ellipticity angle) and wave types for multiple seismic phases.
Conclusions:
- Rotational ground-motion data offer significant seismological value, enhancing wavefield characterization and inverse problem solutions.
- The provided Python codes facilitate the reproduction of 6DOF processing, encouraging wider adoption in seismology.
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