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<p>Arc volcanoes are fed by complex networks of storage zones that extend throughout the crust. Though the geometric details of these transcrustal magmatic systems are well resolved beneath several volcanic settings, the relationship between magma transport at depth and volcanic unrest at the surface remains poorly understood. At Laguna del Maule in central Chile, we show that seismically imaged magma reservoirs in the upper and lower crust are connected by a zone of deep crustal seismicity. A pronounced one-day seismic swarm in 2018 was followed approximately 3 months later by an increase in surface uplift rate. We infer that this swarm was driven by the injection of new melt, transported between lower to upper crust magma reservoirs. The lag time between melt transport and surface acceleration was perhaps governed by the hydraulic diffusivity within the upper crustal reservoir. These results indicate that volcanic unrest begins deep within the crust and months before observable signals of shallow reservoir pressurization.</p>

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Transcrustal magma ascent beneath Laguna del Maule, Chile

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月24日

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  • Jim Bradford,
  • Sankha Subhra Mahanti,
  • Eric Kiser,
  • Susan Beck,
  • Martin Fernandez,
  • Sol Trad,
  • Ryan Porter,
  • Sebastian Tauber,
  • Ariane Maharaj,
  • Hannah Howe,
  • Gustavo Federico Ortiz,
  • Mauro Saez

摘要

Arc volcanoes are fed by complex networks of storage zones that extend throughout the crust. Though the geometric details of these transcrustal magmatic systems are well resolved beneath several volcanic settings, the relationship between magma transport at depth and volcanic unrest at the surface remains poorly understood. At Laguna del Maule in central Chile, we show that seismically imaged magma reservoirs in the upper and lower crust are connected by a zone of deep crustal seismicity. A pronounced one-day seismic swarm in 2018 was followed approximately 3 months later by an increase in surface uplift rate. We infer that this swarm was driven by the injection of new melt, transported between lower to upper crust magma reservoirs. The lag time between melt transport and surface acceleration was perhaps governed by the hydraulic diffusivity within the upper crustal reservoir. These results indicate that volcanic unrest begins deep within the crust and months before observable signals of shallow reservoir pressurization.