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Calibration of the Seismometer at the Seismic Station

Author: LinZhan
Tutor: XueBing
School: China Seismological Bureau, Institute of Earthquake Prediction
Course: Solid Earth Physics
Keywords: Seismometer calibration STEP CALIBRATION Sinusoidal calibration Seismometer sensitivity
CLC: P315.62
Type: Master's thesis
Year: 2008
Downloads: 52
Quote: 1
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Abstract


The seismometer is crucial the seismic observation equipment, its performance directly affects the quality of the outputs of the seismic data, its parameters seismic waveform inversion, the basic information of earthquake magnitude. Due to a variety of reasons, with the passage of time and changes in environmental conditions, earthquakes of various performance parameters may vary, therefore, a seismometer, whether delivered, or used in the station process, the need for calibration. Seismometer stations calibration method for the study, including the following three aspects: step calibration sine calibration and comparison test seismometer sensitivity. Three calibration methods are used to measure the transfer function of the seismometer. Step calibration is used to measure the characteristics of seismometer transfer function of the low frequency band. The original the step calibration data processing algorithms during data processing needs human-computer interaction. Moreover, the stability of the calculation result is not high. Therefore, the new step calibration data processing algorithms to solve the two aspects of the problem - the stability of the automatic data processing and calculation results. The entire data processing of the new algorithm does not require the participation of the people. The computer can completely replace the complete daily calibration data processing work. The results of data processing with a small discrete nature. After the experiment, the seismometer one BBVS-60 calibration results many times the maximum relative deviation is 0.03%. The sinusoidal calibration is used to measure seismic taking into account the characteristics of the transfer function of the entire band. The original sine calibration during data processing data processing algorithms require human-computer interaction. New sinusoidal calibration data processing program also increase the degree of automation of the data processing, the high-frequency and low-frequency waveform employs two different identification methods, can effectively automatically pick up the waveform to be measured, to achieve automatic processing computer; high distortion The audio data can also be restored, and improve measurement accuracy. Whether it is the the sinusoidal calibration or step calibration are only given the relative sensitivity seismometer, To calculate the absolute sensitivity seismometer is necessary to use the method of comparison test. This article describes a comparison test of the experimental methods and data processing algorithms, and by the power spectrum of the input seismometer seismometer own noise power spectral analysis of the signal-to-noise ratio, and illustrate the impact of noise on the stability of the calculation results. The first chapter describes the significance of the paper background. The second chapter for each of the step calibration, the sinusoidal calibration and comparison test method, describes the basic principles of each test method, the existing problems and the proposed solutions for the problem. The third chapter describes how to use the method of signal processing and numerical analysis of specific solutions. Chapter enumeration algorithm testing the experimental results and the results were analyzed. Chapter summarize the full text. The sinusoidal calibration and step calibration algorithm described in this article has been used in China Digital Earthquake Observation Network \Comparison test sensitivity algorithm Matlab script language and in seismic observation laboratory.

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CLC: > Astronomy,Earth Sciences > Geophysics > Earth ( rock circles ) physics ( geophysics ) > Seismology > Seismometry > Seismic observation instruments and equipment
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