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Observations of the seiche that shook the world

Author

Listed:
  • Thomas Monahan

    (University of Oxford)

  • Tianning Tang

    (University of Oxford
    University of Manchester)

  • Stephen Roberts

    (University of Oxford)

  • Thomas A. A. Adcock

    (University of Oxford)

Abstract

On September 16th, 2023, an anomalous 10.88 mHz seismic signal was observed globally, persisting for 9 days. One month later an identical signal appeared, lasting for another week. Several studies have theorized that these signals were produced by seiches which formed after two landslide-generated mega-tsunamis in an East Greenland fjord. This theory is supported by seismic inversions, and analytical and numerical modeling, but no direct observations have been made. Here, we present primary observations of this phenomenon using data from the Surface Water Ocean Topography mission. By ruling out other oceanographic processes, we validate the seiche theory of previous authors and independently estimate its initial amplitude at 7.9 m using Bayesian machine learning and seismic data. This study demonstrates the value of satellite altimetry for studying fast oceanic processes and extreme events, while also highlighting the need for specialized methods to address the altimetric data’s limitations, namely temporal sparsity. These data and approaches will help in understanding future unseen extremes driven by climate change.

Suggested Citation

  • Thomas Monahan & Tianning Tang & Stephen Roberts & Thomas A. A. Adcock, 2025. "Observations of the seiche that shook the world," Nature Communications, Nature, vol. 16(1), pages 1-14, December.
  • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-59851-7
    DOI: 10.1038/s41467-025-59851-7
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    References listed on IDEAS

    as
    1. Andrew Gelman & Ben Goodrich & Jonah Gabry & Aki Vehtari, 2019. "R-squared for Bayesian Regression Models," The American Statistician, Taylor & Francis Journals, vol. 73(3), pages 307-309, July.
    2. Laura Landrum & Marika M. Holland, 2020. "Extremes become routine in an emerging new Arctic," Nature Climate Change, Nature, vol. 10(12), pages 1108-1115, December.
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