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A New Method to Improve the Detection of Co-Seismic Ionospheric Disturbances using Sequential Measurement Combination
Seonho Kang1, Junesol Song2, Deokhwa Han1
1Mechanical and Aerospace Engineering, and the SNU-IAMD, Seoul National University, Seoul 08826, Korea.
Sensors (Basel, Switzerland)
|July 7, 2019
Summary
Detecting weak co-seismic ionospheric disturbances (CIDs) from earthquakes is challenging. A new sequential carrier phase measurement method improves CID detection by increasing the signal-to-noise ratio, aiding earthquake impact analysis.
Area of Science:
- Geophysics
- Atmospheric Science
- Space Science
Background:
- Earthquakes generate co-seismic ionospheric disturbances (CIDs) detectable in ionospheric delay measurements.
- CID signals are often weak due to atmospheric energy dissipation, making detection difficult, especially at distant stations.
Purpose of the Study:
- To develop an improved method for detecting weak co-seismic ionospheric disturbances (CIDs).
- To enhance the analysis of earthquake-induced ionospheric effects by improving CID detection performance.
Main Methods:
- A novel detection method utilizing sequential carrier phase-based ionospheric delay data with a 1-second interval.
- Comparison of the proposed method against conventional techniques like band-pass filters and time-derivative methods.
Main Results:
- The proposed method achieved a maximum increase of 13% in the co-seismic ionospheric disturbance-to-noise ratio.
- Demonstrated improved detection performance for weak CIDs compared to existing methods.
Conclusions:
- The new sequential measurement combination method effectively enhances the detection of weak co-seismic ionospheric disturbances.
- This advancement is crucial for utilizing sparse Global Navigation Satellite System data for seismic event analysis.
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