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A seismometer that can be used to study pre-quake signals
1Chemistry, Computer, and Physical Science, Southeastern Oklahoma State University, 425 W. University Blvd., Durant, Oklahoma 74701, USA.
The Review of Scientific Instruments
|August 3, 2022
Summary
This study developed a broadband seismometer to detect potential earthquake precursors. The instrument identified precursor signals, though not consistently across all tested variables, suggesting further research is needed.
Area of Science:
- Seismology
- Geophysics
- Electromagnetism
Background:
- Developing reliable earthquake precursors is crucial for early warning systems.
- Existing seismic monitoring methods can be enhanced by integrating multi-variable precursor detection.
Purpose of the Study:
- To design and test a sensitive broadband seismometer capable of detecting potential earthquake precursors.
- To investigate the correlation between seismic events and precursor signals including electric fields and electromagnetic spectra.
Main Methods:
- Utilized frequency modulation and 2D Fourier transform for seismic recordings.
- Integrated sensors for electric field changes, extremely low frequency (3-30 Hz) and very low frequency (0.3-3 Hz) electromagnetic spectra, and seismic resonances (10.1, 15.9 Hz).
Main Results:
- All five tested sensor types detected possible precursors before seismic events.
- Extremely low frequency (3-30 Hz) and very low frequency (0.3-3 Hz) signals were not consistently observed for all earthquakes.
- Broadband strobing was notably recorded hours before a specific earthquake, warranting further investigation.
Conclusions:
- The developed seismometer shows promise in detecting potential earthquake precursors.
- Further research, potentially including magnetometers and enhanced seismic resonators, is recommended to improve precursor detection reliability.
- Investigating the earth-ionosphere conduction mechanism may explain inconsistent precursor signal observations.
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