Large submarine landslides in the Japan Trench: a new scenario for additional tsunami generation.
Open accessAbstract
We describe in detail possible large submarine landslides, several tens of kilometers in length and width, on the trench landward slope of the Japan Trench on the basis of high‐resolution topographic surveys and detailed seafloor observations. These slides stopped at the toe of the trench slope. After initial movement of the toe along a basal decollement or thrust of the trench landward slope wedge during an earthquake, the basal frictional condition(s) might change drastically from static to dynamic, thus reducing the frictional strength. As a result, rapid submarine landsliding push downward on the toe, generating large horizontal displacements for tsunamis. This hypothesis should explain suitably the relation between large displacement of the thrust fault and tsunami generation by the 2011 Tohoku earthquake as well as tsunami generation by the 1896 Tohoku earthquake.
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The acoustic facies of these depositional bodies are distinct from chaotic reflection patterns and irregular top morphology in areas where local deep-seated slumps have transported older sedimentary units to trench basins or where shallow co-seismic slip propagation has deformed trench sediment.
“The acoustic facies of these depositional bodies are distinct from chaotic reflection patterns and irregular top morphology in the areas where local deep-seated slumps have transported older sedimentary units to trench basins (Kawamura et al., 2012; Strasser et al., 2013) or where shallow co-seismic slip propagation has deformed trench sediment (Kodaira et al., 2012).”
From Event Stratigraphy in a Hadal Oceanic Trench: The Japan Trench as Sedimentary Archive Recording Recurrent Giant Subduction Zone Earthquakes and Their Role in Organic Carbon Export to the Deep Sea (2019) · cites this paper as Kawamura et al., 2012
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References 18 · Cited by 82
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- [10]10. Sasaki, T. (2004), Subduction tectonics in the northern Japan Trench based on seafloor swath mapping bathymetry, PhD thesis, 152 pp., Univ. of Tokyo, Tokyo.
- Authors
- Kawamura, K., Sasaki, T., Kanamatsu, T., Sakaguchi, A., & Ogawa, Y.
- Affiliations
- Japan Agency for Marine-Earth Science and Technology (JP)
- Atmosphere and Ocean Research Institute, The University of Tokyo (JP)
- University of Tsukuba (JP)
- Venue
- Geophysical Research Letters
- Publisher
- American Geophysical Union (AGU)
- Published
- 2012-03
- Volume
- 39
- Issue
- 5
- ISSN
- 0094-8276 (ISSN-L)
- 1944-8007
- OpenAlex
- W1486666236
- Cited by
- 82
- References
- 18
- Citations by year
- 2025: 3 · 2024: 1 · 2023: 3 · 2022: 2 · 2021: 4 · 2020: 7 · 2019: 12 · 2018: 4 · 2017: 8 · 2016: 8 · 2015: 9 · 2014: 7 · 2013: 12 · 2012: 2
- FWCI
- 16.78
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Geophysical Research Letters (publishedVersion)
- Funders
- Ministry of Education, Culture, Sports, Science and Technology
- Ministerio de Educación, Cultura y Deporte
- Japan Society for the Promotion of Science (21107003)
- Japan Agency for Marine-Earth Science and Technology
- Topics
- Physical Sciences › Earth and Planetary Sciences › Geophysics › earthquake and tectonic studies
- Physical Sciences › Earth and Planetary Sciences › Earth-Surface Processes › Geological formations and processes
- Physical Sciences › Engineering › Civil and Structural Engineering › Earthquake and Tsunami Effects
- Keywords
- submarine landslides, Japan Trench, tsunami generation, Great East Japan Earthquake, bathymetry
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