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<p>At subduction zones, the occurrence of slow slip events and tremor is often attributed primarily to fluids released from the subducting plate. Yet, sufficiently high-resolution constraints on along-strike variations in the extent and nature of incoming plate hydration required to assess the role of fluids are lacking. Using a high-resolution P-wave velocity model, we estimate the water contents of the young incoming Cocos plate before it subducts beneath the Guerrero Gap and adjacent segments, which exhibit variations in slip behavior. Seaward of the Guerrero Gap, large seamounts contain 1.5-3 times more water, suggesting a possible link between seamount subduction and the aseismic character of the gap. However, widespread upper-crustal hydration and subducting seamounts outside the gap where large earthquakes regularly occur suggest incoming plate hydration alone cannot account for megathrust slip variability offshore Mexico.</p>

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Limited direct links between slip variability and incoming plate structure at the Guerrero gap offshore Mexico

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年8月5日

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  • Tanner Acquisto,
  • Anne Bécel,
  • Víctor M. Cruz-Atienza,
  • Donna Shillington,
  • Brandon Shuck,
  • Brian Boston,
  • Davis Hagemeier,
  • Shuoshuo Han,
  • Jorge Real-Pérez,
  • Grace Ward,
  • Yoshihiro Ito

摘要

At subduction zones, the occurrence of slow slip events and tremor is often attributed primarily to fluids released from the subducting plate. Yet, sufficiently high-resolution constraints on along-strike variations in the extent and nature of incoming plate hydration required to assess the role of fluids are lacking. Using a high-resolution P-wave velocity model, we estimate the water contents of the young incoming Cocos plate before it subducts beneath the Guerrero Gap and adjacent segments, which exhibit variations in slip behavior. Seaward of the Guerrero Gap, large seamounts contain 1.5-3 times more water, suggesting a possible link between seamount subduction and the aseismic character of the gap. However, widespread upper-crustal hydration and subducting seamounts outside the gap where large earthquakes regularly occur suggest incoming plate hydration alone cannot account for megathrust slip variability offshore Mexico.