Technical troubles encountered in the seismic observation network of Pacific21

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Real-time monitoring of broadband seismographs through the Internet enables us to discover various technical troubles of broadband seismic observation system of Pacific21 and to take measures to solve them at the next field maintenance occasions. This paper summarizes the characteristics and the countermeasures of four typical troubles that we discovered from real-time monitoring or encountered in our maintenance work. One trouble was a deviation of seismometer's response owing to insufficient insulation of its connector. It was very effective to protect the connectors from moisture as a preventive measure. Another trouble was that spike-like noise was generated in the seismometer's output when some equipment demanded high current from the power supply. In order to remove the noises, we have two solutions: to disconnect extra impedance from the grounding line for power return, and to improve the power supply. A third was high frequency noise from one-sided connection of differential signaling. It is important to check the waveforms diligently to find this trouble as soon as possible. The other was that the data logger's dedicated hard disk often stopped for a maximum of several hours. The frequency of bard disk's shutdown seems to depend on its firmware version. For this trouble, we learned that we should operate equipment with various firmware versions for some time before installation.
独立行政法人海洋研究開発機構の論文