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B-27 (339) J. Wiszniowski, Broadband Seismic System: Effect of Transfer Band on Detection and Recording of Seismic Waves

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1. Introduction, 3

2. History of designing digital seismic instruments at the Institute of Geophysics of the Polish Academy of Sciences, 9

3. Principle of operation of the broad-band seismic data acquisition system MK-6, 15

3.1 Sampling and timing of the signal, 16

3.2 Dynamics of the recording, 20

3.3 Seismic signal filtration, 29

3.4 Recording and processing of seismic observations by a computer, 39

4. Seismic instruments responses, 45

4.1 Methods for describing the instrument´s response function, 45

4.2 Methods for determining the instrument´s response function, 51

4.3 Response of the MK-6 instrument, 58

5. Measurement of noise on the basis of MK-6 recording, 75

5.1 Self-noise, 76

5.2 Seismic background noise recorded at the station, 79

5.3 Real dynamics of the earthquake recording system, 82

6. Detection algorithms of the recorded earthquakes, 87

6.1 Detection in time domain based on the STA/LTA algorithm, 92

6.2 Detection in the frequency domain, 103

6.3 Detection by means of artificial neural network, 105

7. Examples of recording, 129

7.1 Local and regional earthquakes, 129

7.2 Recordings of teleseismic events, 137

8. Summary, 143

Appendix A. Description of transfer functions of the MK-6 instrument, 151

Appendix B. Algorithms of earthquake detection programs, 159

Appendix C. UMSS data format, 169

Appendix D. Example of a file with seismic station description, 171

References, 173

Acknowledgments, 177


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