Features of Software Implementation of Low-Frequency Deconvolution Algorithms

The low-frequency deconvolution method makes it possible to convert digital records of electrodynamic seismometers to records of virtual sensors of a similar type, but with a lower natural frequency. The procedure requires only knowledge of the sensor parameters, which can be found from its technica...

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Bibliographic Details
Published inSeismic instruments Vol. 55; no. 3; pp. 345 - 352
Main Authors Dergach, P. A., Tubanov, Ts. A., Yushin, V. I., Duchkov, A. A.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.07.2019
Springer Nature B.V
Subjects
Algorithms
Deconvolution
Digital records
Earth and Environmental Science
Earth Sciences
Geophysics/Geodesy
Numerical integration
Recording
Recording equipment
Records
Resonant frequencies
Resonant frequency
Sampling
Seismicity
Seismographs
Seismology
Seismometers
Signal distortion
frequency response correction
frequency correction of recording
seismic monitoring
low-frequency deconvolution
natural frequency reduction
electrodynamic seismic receiver
natural frequency
velocimeter
local seismology
geophone
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Summary:The low-frequency deconvolution method makes it possible to convert digital records of electrodynamic seismometers to records of virtual sensors of a similar type, but with a lower natural frequency. The procedure requires only knowledge of the sensor parameters, which can be found from its technical description or obtained by calibration. Deconvolution in the time domain requires attention in choosing a numerical integration method, since use of the simplest methods leads to signal distortion. This is especially noticeable when the sampling rate of the original record is close to a geophone’s natural frequency. A universal approach is presented: realization of a low-frequency deconvolution algorithm in the frequency domain. Testing has shown good accuracy both in synthetic tests and for real seismological records, which were used to demonstrate reconstruction of the low-frequency component of a seismic geophone signal. The results are mainly relevant for problems that use a low sampling rate of recording, and they place high demands on the metrological characteristics of the recording equipment (e.g., local and regional seismicity monitoring).
ISSN:0747-9239
1934-7871
DOI:10.3103/S0747923919030046