single-dr.php

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

Paper:

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

Received:
December 10, 2021
Accepted:
June 16, 2022
Published:
August 1, 2022
Keywords:
seismic observation, optical interferometry, volcano observatory, eruption, lightning
Abstract

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.
Data files:
References
  1. [1] K. Hamada, M. Ohtake, Y. Okada et al., “Kanto-Tokai Observation Network of Crustal Activities-National Research Center for Disaster Prevention,” Zisin, Vol.35, No.3, pp. 401-426, doi: 10.4294/zisin1948.35.3_401, 1982 (in Japanese).
  2. [2] Y. Okada, “Seismology: First results from Japanese network for earthquake prediction,” Nature, Vol.312, No.5994, pp. 500-501, doi: 10.1038/312500a0, 1984.
  3. [3] Y. Okada, K. Kasahara, S. Hori et al., “Recent progress of seismic observation networks in Japan – Hi-net, F-net, K-NET and KiK-net –,” Earth, Planets and Space, Vol.56, No.8, pp. xv-xxviii, doi: 10.1186/BF03353076, 2004.
  4. [4] K. Obara, K. Kasahara, S. Hori et al., “A densely distributed high-sensitivity seismograph network in Japan: Hi-net by National Research Institute for Earth Science and Disaster Prevention,” Rev. Sci. Instrum., Vol.76, No.2, Article No.021031, doi: 10.1063/1.1854197, 2005.
  5. [5] T. Tanada, H. Ueda, M. Nagai et al., “NIED’s V-net, the fundamental volcano observation network in Japan,” J. Disaster Res., Vol.12, No.5, pp. 926-931, doi: 10.20965/jdr.2017.p0926, 2017.
  6. [6] Z. Zhan, “Distributed acoustic sensing turns fiber-optic cables into sensitive seismic antennas,” Seismol. Res. Lett., Vol.91, No.1, pp. 1-15, doi: 10.1785/0220190112, 2019.
  7. [7] T. Nishimura, K. Emoto, H. Nakahara et al., “Source location of volcanic earthquake and subsurface characterization using fiber-optic cable and distributed acoustic sensing system,” Sci. Rep., Vol.11, Article No.6319, doi: 10.1038/s41598-021-85621-8, 2021.
  8. [8] M. Yoshida, Y. Hirayama, A. Takahara et al., “Real-time displacement measurement system using phase-shifted optical pulse interferometry: Application to a seismic observation system,” Jpn. J. Appl. Phys., Vol.55, No.2, Article No.022701, doi: 10.7567/JJAP.55.022701, 2016.
  9. [9] Y. Ohe, H. Kimura, N. Inou et al., “Verification of principle of a new vibrating sensor with optical interferometry and the application possibility,” Trans. Soc. Instrum. Control Eng., Vol.54, No.1, pp. 111-117, 2018 (in Japanese).
  10. [10] T. Tsutsui, Y. Hirayama, T. Ikeda et al., “Feasibility study on a multi-channeled seismometer system with phase-shifted optical interferometry for volcanological observations,” J. Disaster Res., Vol.14, No.4, pp. 592-603, doi: 10.20965/jdr.2019.p0592, 2019.
  11. [11] T. Eto, “An estimation of the amount and the dispersal of volcanic ash-falls ejected by summit eruptions at Sakurajima Volcano,” Proc. Kagoshima Int. Conf. on Volcanoes, pp. 448-451, 1989.
  12. [12] T. Eto, “Estimation of the amount and dispersal of volcanic ash-fall deposits ejected by vulcanian type eruption,” Rep. Fac. Sci. Kagoshima Univ., Vol.34, pp. 35-46, 2001.
  13. [13] Kagoshima Meteorological Office, https://www.jma-net.go.jp/kagoshima/vol/data/skr_exp_list/skr_exp_2019.html [accessed May 6, 2022]
  14. [14] N. S. Neidell and M. T. Taner, “Semblance and other coherency measures for multichannel data,” Geophysics, Vol.36, No.3, pp. 482-497, doi: 10.1190/1.1440186, 1971.
  15. [15] T. Tameguri, M. Iguchi, and K. Ishihara, “Mechanism of explosive eruptions from moment tensor analyses of explosion earthquakes at Sakurajima Volcano, Japan,” Bull. Volcanol. Soc. Japan, Vol.47, No.4, pp. 197-215, doi: 10.18940/kazan.47.4_197, 2002.
  16. [16] T. Tsutsui, M. Iguchi, T. Tameguri et al., “Structural evolution beneath Sakurajima Volcano, Japan, revealed through rounds of controlled seismic experiments,” J. Volcanol. Geotherm. Res., Vol.315, pp. 1-14, doi: 10.1016/j.jvolgeores.2016.02.008, 2016.
  17. [17] R. H. Golde, “Lightning surges on overhead distribution lines caused by indirect and direct lightning strokes [includes discussion],” Trans. American Inst. Electrical Engineers Part III: Power Apparatus and Systems, Vol.73, Issue 1, pp. 437-447, doi: 10.1109/AIEEPAS.1954.4498839, 1954.
  18. [18] Hakusan Corporation, https://www.hakusan.co.jp/english/solution/optical_sensor [accessed May 6, 2022]

*This site is desgined based on HTML5 and CSS3 for modern browsers, e.g. Chrome, Firefox, Safari, Edge, Opera.

Last updated on Aug. 05, 2022