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April 5, 2026Journal of Geophysical Research Solid Earth

Rheological Properties and Induced‐Coulomb Stress in the Southern Sumatra Subduction Zone: Insights From the 2007 Mw8.4 Bengkulu Earthquake

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Authors

SYS. YangYHYan HuJLJian Lin

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Overview

Observations reveal deformation and stress changes in the southern Sumatra region, suggesting implications for future earthquakes.

Key Points

  • The aim is to investigate the rheological structure and stress effects in the southern Sumatra subduction zone following the 2007 earthquake.
  • Used GPS observations for 3 years post-earthquake.
  • Employed a three-dimensional viscoelastic finite element model.
  • Analyzed the shear zone's viscosity and afterslip behavior.
  • Divided the shear zone into shallow and deep segments.
  • A continuous afterslip of about 1 cm was observed post-earthquake.
  • Shallow shear zone afterslip reached up to ∼3.3 m.
  • Deep shear zone afterslip measured up to approximately 1 m.
  • Enhanced Coulomb stress loading was observed for subsequent large earthquakes.

Cite This Study

Yang et al. (2026) studied this question.

synapsesocial.com/papers/69d1fd9ca79560c99a0a3c67https://doi.org/10.1029/2025jb032637
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