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Articles | Volume 16, issue 7
Articles | Volume 16, issue 7
https://doi.org/10.5194/se-16-593-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-16-593-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 16, issue 7
Research article
 | 
02 Jul 2025
Research article |  | 02 Jul 2025

Importance of forearc topography for the triggering of aftershocks of megathrust earthquakes: insights from mechanical models and the Tohoku-Oki and Maule earthquakes

Armin Dielforder, Gian Maria Bocchini, and Andrea Hampel

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Latest update: 02 Jul 2025
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Short summary
Subduction zones feature a large elevation difference between the deep oceanic trench and the high mountains on land, which causes stress in the upper plate. We investigate how the topographic stress affects the aftershock seismicity of large subduction earthquakes using analytical and numerical stress models. We show that topographic stress has a large influence on aftershock seismicity and promoted most of the seismicity after the Tohoku-Oki (Japan) and Maule (Chile) earthquakes.
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