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Change of deep subduction seismicity after a large megathrust earthquake

Author

Listed:
  • Blandine Gardonio

    (Univ Lyon 1, ENSL, CNRS, LGL-TPE
    PSL Research University)

  • David Marsan

    (Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, University Gustave Eiffel, ISTerre)

  • Thomas Bodin

    (Univ Lyon 1, ENSL, CNRS, LGL-TPE)

  • Anne Socquet

    (Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, University Gustave Eiffel, ISTerre)

  • Stéphanie Durand

    (Univ Lyon 1, ENSL, CNRS, LGL-TPE)

  • Mathilde Radiguet

    (Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, University Gustave Eiffel, ISTerre)

  • Yanick Ricard

    (Univ Lyon 1, ENSL, CNRS, LGL-TPE)

  • Alexandre Schubnel

    (PSL Research University)

Abstract

Subduction zones are home to the world’s largest and deepest earthquakes. Recently, large-scale interactions between shallow (0-60 km) and intermediate (80-150 km) seismicity have been evidenced during the interseismic period but also before and after megathrust earthquakes along with large-scale changes in surface motion. Large-scale deformation transients following major earthquakes have also been observed possibly due to a post-seismic change in slab pull or to a bending/unbending of the plates, which suggests the existence of interactions between the deep and shallow parts of the slab. In this study, we analyze the spatio-temporal variations of the declustered seismicity in Japan from 2000 to 2011/3/11 and from 2011/3/11 to 2013/3/11. We observe that the background rate of the intermediate to deep (150-450 km) seismicity underwent a deceleration of 55% south of the rupture zone and an acceleration of 30% north of it after the Tohoku-oki earthquake, consistent with the GPS surface displacements. This shows how a megathrust earthquake can affect the stress state of the slab over a 2500 km lateral range and a large depth range, demonstrating that earthquakes interact at a much greater scale than the surrounding rupture zone usually considered.

Suggested Citation

  • Blandine Gardonio & David Marsan & Thomas Bodin & Anne Socquet & Stéphanie Durand & Mathilde Radiguet & Yanick Ricard & Alexandre Schubnel, 2024. "Change of deep subduction seismicity after a large megathrust earthquake," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-023-43935-3
    DOI: 10.1038/s41467-023-43935-3
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    References listed on IDEAS

    as
    1. K. R. Felzer & E. E. Brodsky, 2006. "Decay of aftershock density with distance indicates triggering by dynamic stress," Nature, Nature, vol. 441(7094), pages 735-738, June.
    2. Tianhaozhe Sun & Kelin Wang & Takeshi Iinuma & Ryota Hino & Jiangheng He & Hiromi Fujimoto & Motoyuki Kido & Yukihito Osada & Satoshi Miura & Yusaku Ohta & Yan Hu, 2014. "Prevalence of viscoelastic relaxation after the 2011 Tohoku-oki earthquake," Nature, Nature, vol. 514(7520), pages 84-87, October.
    3. Jonathan R. Bedford & Marcos Moreno & Zhiguo Deng & Onno Oncken & Bernd Schurr & Timm John & Juan Carlos Báez & Michael Bevis, 2020. "Months-long thousand-kilometre-scale wobbling before great subduction earthquakes," Nature, Nature, vol. 580(7805), pages 628-635, April.
    4. Yusuke Yokota & Kazuki Koketsu, 2015. "A very long-term transient event preceding the 2011 Tohoku earthquake," Nature Communications, Nature, vol. 6(1), pages 1-5, May.
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