Enhancing Climate Resilience with Distributed Acoustic Sensing (DAS): from Land to the Sea

沈智超 研究员

中国科学院精密测量科学与技术创新研究院

2026.03.13（星期五）16:00，理科二号楼2821

摘要：

In the face of climate variability, quantifying the dynamics of Earth’s hydrosphere across time and space is crucial for understanding the interconnected systems of the atmosphere, ocean, and solid earth. Distributed acoustic sensing (DAS), that converts ubiquitous fiber-optic cables into extensive networks of seismic sensors, presents a cost-effective seismic sensing tool for characterizing Earth’s water reservoirs over large spatiotemporal scales, thereby enhancing our climate resilience. In this talk, I will demonstrate how DAS can be employed to capture subsurface (vadose zone) water dynamics through fiber-optic seismic sensing, and to measure ocean temperature changes via seismic ocean thermometry (SOT). For the subsurface part, I will first introduce the fiber-optic seismic sensing principle by combining DAS with 4D seismology and rock physics. The first application of fiber seismic sensing to a DAS array in Ridgecrest, CA, revealed sub-seasonal precipitation replenishments and a prolonged drought in the vadose zone spanning over 2.5 years in fine spatial resolution. For the ocean part, I will illustrate how ocean bottom DAS can improve the detection capability of ocean seismo-acoustic waves (i.e., T-waves), which makes more small repeating earthquakes useable for global SOT applications. In conclusion, DAS can offer a scalable, long-term solution for large scale environmental monitoring, making it an invaluable tool toward better climate adaptation and preparation.

报告人简介：

沈智超，中国科学院精密测量科学与技术创新研究院研究员。2013年和2016年分别获中国科学技术大学学士和硕士学位，2022年获美国加州理工学院地球物理学博士学位，之后在伍兹霍尔海洋研究所从事博士后研究工作至2026年1月。主要研究方向为圈层耦合地震波理论及其应用，聚焦海洋地震学、分布式光纤传感及地球深内部结构等领域。在NC、GRL、JGR等期刊发表论文20余篇，获国内外媒体报道10余次，担任SRL期刊环境地震学专刊客座编辑及NSR、SA、GRL等多个国内外期刊审稿人。