JDR Vol.17 No.5 pp. 670-682
doi: 10.20965/jdr.2022.p0670


A Half-Year Long Observation at Sakurajima Volcano, Japan Using a Multi-Channeled Seismometer System with Phase-Shifted Optical Interferometry

Haruhisa Nakamichi*,†, Yoshiharu Hirayama**, Toshiharu Ikeda**, Hiroshi Ando**, and Keiji Takeuchi**

*Sakurajima Volcano Research Center, Disaster Prevention Research Institute, Kyoto University
1722-19 Sakurajima-Yokoyama-cho, Kagoshima, Kagoshima 891-1419, Japan

Corresponding author

**Hakusan Corporation, Fuchu, Japan

December 10, 2021
June 16, 2022
August 1, 2022
seismic observation, optical interferometry, volcano observatory, eruption, lightning

The performance of a multi-channel seismometer system with phase-shifted optical interferometry was improved by newly introduced sensors and a processing unit. The current version of the system consists of three optical wired seismometers and the unit. We deployed the system at Sakurajima Volcano and successfully operated it from June to December 2019. As the Sakurajima Volcano frequently erupts, a number of eruption events were observed during the observation period, as were a number of lightning strikes. In this study, we evaluated the observation performance of the volcanic earthquake and the noise caused by the lightning, using the spectrum and amplitude of the waveform. The results show that this sensor can observe earthquakes caused by eruptions as well as ordinary seismometers do. When the lightning struck, pulsed noise with power in a wide frequency band was observed in the existing seismometer, but not in the new sensor. Therefore, the observation was not affected by lightning. In addition, this system was found to be effective in the array analysis of volcanic earthquakes.

Cite this article as:
H. Nakamichi, Y. Hirayama, T. Ikeda, H. Ando, and K. Takeuchi, “A Half-Year Long Observation at Sakurajima Volcano, Japan Using a Multi-Channeled Seismometer System with Phase-Shifted Optical Interferometry,” J. Disaster Res., Vol.17 No.5, pp. 670-682, 2022.
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