Weber Gregor, Biggs Juliet, Annen Catherine
COMET, School of Earth Sciences, University of Bristol, Bristol, UK.
Institute of Geophysics of the Czech Academy of Sciences, Prague, Czechia.
Nat Commun. 2025 Jan 9;16(1):532. doi: 10.1038/s41467-024-55443-z.
Volcano deformation can be detected over timescales from seconds to decades, offering valuable insights for magma dynamics. However, these signals are shaped by the long-term evolution of magmatic systems, a coupling that remains poorly understood. Here we integrate thermal models of crustal-scale magmatism with thermo-mechanical simulations of ground deformation. This allows us to determine the influence of magmatic flux over 10-10 years on viscoelastic deformation spanning a 10-year observation period. Our results reveal a coupling between surface deformation and the thermal evolution of magma systems, modulated by magma flux and system lifespan. Relatively cold magma systems exhibit cycles of uplift and subsidence, while comparatively hot plumbing systems experience solely uplift. These findings align with geophysical observations from caldera systems, emphasizing the potential of surface deformation measurements as tool for deciphering the state and architecture of magmatic systems. Considering long-term magmatic system evolution is imperative for accurate interpretation of volcanic unrest.
火山变形可以在从秒到数十年的时间尺度上被检测到，这为岩浆动力学提供了有价值的见解。然而，这些信号受到岩浆系统长期演化的影响，这种耦合关系仍未得到很好的理解。在这里，我们将地壳尺度岩浆作用的热模型与地面变形的热机械模拟相结合。这使我们能够确定10¹⁰年时间内岩浆通量对跨越10年观测期的粘弹性变形的影响。我们的结果揭示了地表变形与岩浆系统热演化之间的耦合关系，这种关系受岩浆通量和系统寿命的调节。相对较冷的岩浆系统表现出隆升和沉降的循环，而相对较热的管道系统则只经历隆升。这些发现与来自破火山口系统的地球物理观测结果一致，强调了地表变形测量作为解读岩浆系统状态和结构工具的潜力。考虑长期岩浆系统演化对于准确解释火山活动至关重要。
