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Monitoring eruption activity using temporal stress changes at Mount Ontake volcano

Author

Listed:
  • Toshiko Terakawa

    (Earthquake and Volcano Research Center, Graduate School of Environmental Studies, Nagoya University)

  • Aitaro Kato

    (Earthquake and Volcano Research Center, Graduate School of Environmental Studies, Nagoya University)

  • Yoshiko Yamanaka

    (Earthquake and Volcano Research Center, Graduate School of Environmental Studies, Nagoya University)

  • Yuta Maeda

    (Earthquake and Volcano Research Center, Graduate School of Environmental Studies, Nagoya University)

  • Shinichiro Horikawa

    (Earthquake and Volcano Research Center, Graduate School of Environmental Studies, Nagoya University)

  • Kenjiro Matsuhiro

    (Earthquake and Volcano Research Center, Graduate School of Environmental Studies, Nagoya University)

  • Takashi Okuda

    (Earthquake and Volcano Research Center, Graduate School of Environmental Studies, Nagoya University)

Abstract

Volcanic activity is often accompanied by many small earthquakes. Earthquake focal mechanisms represent the fault orientation and slip direction, which are influenced by the stress field. Focal mechanisms of volcano-tectonic earthquakes provide information on the state of volcanoes via stresses. Here we demonstrate that quantitative evaluation of temporal stress changes beneath Mt. Ontake, Japan, using the misfit angles of focal mechanism solutions to the regional stress field, is effective for eruption monitoring. The moving average of misfit angles indicates that during the precursory period the local stress field beneath Mt. Ontake was deviated from the regional stress field, presumably by stress perturbations caused by the inflation of magmatic/hydrothermal fluids, which was removed immediately after the expulsion of volcanic ejecta. The deviation of the local stress field can be an indicator of increases in volcanic activity. The proposed method may contribute to the mitigation of volcanic hazards.

Suggested Citation

  • Toshiko Terakawa & Aitaro Kato & Yoshiko Yamanaka & Yuta Maeda & Shinichiro Horikawa & Kenjiro Matsuhiro & Takashi Okuda, 2016. "Monitoring eruption activity using temporal stress changes at Mount Ontake volcano," Nature Communications, Nature, vol. 7(1), pages 1-7, April.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms10797
    DOI: 10.1038/ncomms10797
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    Cited by:

    1. Corentin Caudron & Yosuke Aoki & Thomas Lecocq & Raphael Plaen & Jean Soubestre & Aurelien Mordret & Leonard Seydoux & Toshiko Terakawa, 2022. "Hidden pressurized fluids prior to the 2014 phreatic eruption at Mt Ontake," Nature Communications, Nature, vol. 13(1), pages 1-9, December.

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