Minute-scale dynamics of recurrent dike intrusions in Iceland with fiber-optic geodesy

• 成果类型: Article
• 署名作者: Li, Jiaxuan; Biondi, Ettore; Heimisson, Elias Rafn; Puel, Simone; Zhai, Qiushi; Zhang, Shane; Hjorleifsdottir, Vala; Wei, Xiaozhuo; Bird, Elijah; Klesh, Andy; Kamalov, Valey; Gunnarsson, Theodor; Geirsson, Halldor; Zhan, Zhongwen
• 署名单位: California Institute of Technology; University of Houston System; University of Houston; University of Iceland; Reykjavik University; National Aeronautics & Space Administration (NASA); NASA Jet Propulsion Laboratory (JPL); Alphabet Inc.; Google Incorporated
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-10509
• DOI: 10.1126/science.adu0225
• 发表日期: 2025-06-12
• 页码: 1189-1193
• 关键词: deformation; propagation; earthquakes; seismicity; inversion; eruption; cables

摘要

Continuous geodetic measurements near volcanic systems can image magma transport dynamics, yet resolving dike intrusions with high spatiotemporal resolution remains challenging. We introduce fiber-optic geodesy, leveraging low-frequency distributed acoustic sensing (LFDAS) recordings along a telecommunication fiber-optic cable, to track dike intrusions near Grindav & iacute;k, Iceland, on a minute timescale. LFDAS revealed distinct strain responses from nine intrusive events, six resulting in fissure eruptions. Geodetic inversion of LFDAS strain reveals detailed magmatic intrusions, with inferred dike volume rate peaking systematically 15 to 22 min before the onset of each eruption. Our results demonstrate DAS's potential for a dense strainmeter array, enabling high-resolution, nearly real-time imaging of subsurface quasistatic deformations. In active volcanic regions, LFDAS recordings can offer critical insights into magmatic evolution, eruption forecasting, and hazard assessment.