2025-04-24 カリフォルニア工科大学 (Caltech)
＜関連情報＞
- https://www.caltech.edu/about/news/fiber-sensing-technology-can-provide-early-warning-for-volcanic-eruptions
- https://www.science.org/doi/10.1126/science.adu0225
光ファイバー測地学によるアイスランドにおける反復性堤防貫入のミニチュアスケールダイナミクス Minute-scale dynamics of recurrent dike intrusions in Iceland with fiber-optic geodesy
Jiaxuan Li, Ettore Biondi, Elías Rafn Heimisson, Simone Puel, […], and Zhongwen Zhan
Science Published:24 Apr 2025
DOI:https://doi.org/10.1126/science.adu0225
Abstract
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 Grindavík, Iceland, on a minute timescale. LFDAS reveals 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 quasi-static deformations. In active volcanic regions, LFDAS recordings can offer critical insights into magmatic evolution, eruption forecasting, and hazard assessment.
