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Megathrust locking encoded in subduction landscapes.

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  • 1Laboratoire de Géologie, École Normale Supérieure- PSL, CNRS UMR 8538, Paris, France.

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|April 26, 2024
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Summary
This summary is machine-generated.

Subduction megathrust locking creates strain that shapes landscapes over millennia. This study reveals how this interseismic strain, seen as earthquakes and uplift, influences geomorphology in subduction zones.

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Area of Science:

  • Geophysics
  • Tectonics
  • Geomorphology

Background:

  • Subduction megathrusts show correlations between locked areas and landscape features.
  • The mechanisms linking megathrust locking to geomorphology are not well understood.

Purpose of the Study:

  • To investigate how interseismic strain from subduction megathrust locking influences overriding plate deformation and landscape evolution.
  • To explain the geomorphological features observed in subduction zones.

Main Methods:

  • Modeling interseismic strain accumulation and release across the overriding plate.
  • Analyzing the relationship between strain increments and long-term uplift patterns.
  • Connecting modeled uplift to observed geomorphological features like river profiles and marine terraces.

Main Results:

  • Interseismic locking gradients generate distributed seismicity and irreversible strain.
  • Summing strain increments over earthquake cycles results in spatially variable uplift.
  • This long-term uplift explains key geomorphological features of subduction zones, including shelf breaks, marine terraces, and river profiles.

Conclusions:

  • Inelastic forearc yielding encodes megathrust locking patterns into landscapes.
  • Megathrust locking appears stable over multiple earthquake cycles.
  • Geomorphology can serve as a valuable tool for constraining subduction zone seismic hazards.