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Data Processing Methods for 3D Seismic Imaging of Subsurface Volcanoes: Applications to the Tarim Flood Basalt
Published on: August 7, 2017
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A transfer function based on bilinear transformation for narrow-band seismic record.
1Institute of Civil Engineering, Southwest Forestry University, Kunming, China.
Plos One
|May 8, 2024
Summary
A new transfer function improves seismic data accuracy by correcting narrow-band seismograph records. This method enhances low-frequency signal recovery, outperforming existing techniques but with limitations at low signal-to-noise ratios.
Area of Science:
- Geophysics
- Seismology
- Signal Processing
Background:
- Narrow-band seismographs have limited flat response ranges, leading to inaccurate ground motion recordings with reduced low-frequency components.
- Existing transfer functions for correcting seismic records often lack high accuracy.
Purpose of the Study:
- To develop a novel transfer function for more accurate correction of narrow-band seismic velocity records.
- To enhance the recovery of low-frequency components in seismic data.
Main Methods:
- Derived a new transfer function utilizing Laplace transform, bilinear transform, and Nyquist sampling theory.
- Applied the derived transfer function to correct narrow-band velocity records from the Hi-net network.
- Validated corrected records by comparing them with integrated velocities from broad-band acceleration data and with results from the Nakata transfer function.
Main Results:
- The newly derived transfer function demonstrated higher calculation accuracy compared to the Nakata transfer function.
- Accuracy of the new transfer function decreased when the signal-to-noise ratio fell below 24.
- The method was unable to recover signals within the 0.05-0.78 Hz frequency band under specific conditions.
Conclusions:
- The developed transfer function offers a more accurate method for correcting narrow-band seismic velocity data.
- Further research may be needed to address limitations in low signal-to-noise ratio environments and specific frequency bands.
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