{"id":37185,"date":"2026-02-23T09:27:53","date_gmt":"2026-02-23T01:27:53","guid":{"rendered":"https:\/\/www.oc.ntu.edu.tw\/?p=37185"},"modified":"2026-02-23T09:29:37","modified_gmt":"2026-02-23T01:29:37","slug":"quantifying-ocean-to-solid-earth-energy-conversion-using-nearshore-fiber-optic-das","status":"publish","type":"post","link":"https:\/\/www.oc.ntu.edu.tw\/en\/news-en\/37185\/","title":{"rendered":"Quantifying Ocean-to-Solid Earth Energy Conversion Using Nearshore Fiber-Optic DAS"},"content":{"rendered":"\n<p>Understanding how ocean wave energy transfers into the nearshore crust is fundamental for constraining microseism generation mechanisms and assessing coastal hazard impacts. However, direct quantification has long been hindered by the lack of high\u2013temporal-resolution, in-situ observations.<\/p>\n\n\n\n<p>A research team led by Associate Professor Justin Yen-Ting Ko at the Institute of Oceanography, National Taiwan University, deployed a nearshore fiber-optic array at Sizihwan, Kaohsiung, Taiwan. By leveraging Distributed Acoustic Sensing (DAS) technology, the team achieved the first time-resolved, in-situ quantification of this dynamic ocean\u2013solid Earth energy transfer process.<\/p>\n\n\n\n<p>By integrating DAS-derived strain-rate measurements with wave hydrodynamic modeling, the study estimates that the energy conversion efficiency from ocean waves to seismic surface waves (Rayleigh waves) is on the order of 10\u207b\u2076 to 10\u207b\u2075. The results further reveal strong tidal modulation of wave\u2013Earth coupling: higher tidal stages significantly enhance coupling efficiency, even when the source region remains localized near breakwaters and shallow sandbars. This indicates that water-level variations alter the interaction among waves, sediments, and coastal structures.<\/p>\n\n\n\n<p>These findings demonstrate the feasibility of using existing submarine telecommunication fiber networks for real-time coastal monitoring. The approach holds significant potential for evaluating coastal erosion, as well as assessing the structural resilience of critical infrastructure such as breakwaters and offshore wind turbine foundations. This work has been published in <em>Geophysical Research Letters<\/em>:<br>Ko, J. Y.-T., Ho, K.-C., Lin, C.-H., Huang, H.-H., Hsu, H.-H., Huang, C.-F., et al. (2026). <em>Tide-modulated ocean-to-Earth energy conversion quantified with coastal fiber sensing<\/em>. Geophysical Research Letters, 53, e2025GL120302.<br><a href=\"https:\/\/doi.org\/10.1029\/2025GL120302\">https:\/\/doi.org\/10.1029\/2025GL120302<\/a><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1023\" height=\"943\" src=\"https:\/\/www.oc.ntu.edu.tw\/wp-content\/uploads\/2026\/02\/KO260223.jpg\" alt=\"\" class=\"wp-image-37183\" srcset=\"https:\/\/www.oc.ntu.edu.tw\/wp-content\/uploads\/2026\/02\/KO260223.jpg 1023w, https:\/\/www.oc.ntu.edu.tw\/wp-content\/uploads\/2026\/02\/KO260223-768x708.jpg 768w\" sizes=\"(max-width: 1023px) 100vw, 1023px\" \/><\/figure>\n\n\n\n<p><strong>Figure 1 | Nearshore fiber-optic DAS experiment and observations of ocean\u2013Earth energy conversion.<\/strong> (A) Location of the nearshore fiber-optic DAS experimental site at Sizihwan, Kaohsiung, Taiwan. (B) Layout of the submarine fiber-optic cable and the distribution of Ocean Bottom Nodes (OBNs). (C) Ten-minute continuous DAS strain-rate record, with the upper-right inset showing a zoomed one-minute window. The records clearly capture the persistent seismic responses generated by ocean waves impacting the coast. (D) Conceptual diagram illustrating how tidal stage and wave height jointly modulate the efficiency of ocean wave energy conversion into seismic signals during wave\u2013coast interactions.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Understanding how ocean wave energy transfers into the nearshore crust is fundamental for constraining microseism generation mechanisms and assessing coastal hazard impacts. However, direct quantification has long been hindered by the lack of high\u2013temporal-resolution, in-situ observations. A research team led by Associate Professor Justin Yen-Ting Ko at the Institute of Oceanography, National Taiwan University, deployed [&hellip;]<\/p>\n","protected":false},"author":16,"featured_media":37183,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[95,119],"tags":[],"class_list":["post-37185","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news-en","category-research-highlights"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Quantifying Ocean-to-Solid Earth Energy Conversion Using Nearshore Fiber-Optic DAS - Institute of Oceanography, NTU<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.oc.ntu.edu.tw\/en\/news-en\/37185\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Quantifying Ocean-to-Solid Earth Energy Conversion Using Nearshore Fiber-Optic DAS - Institute of Oceanography, NTU\" \/>\n<meta property=\"og:description\" content=\"Understanding how ocean wave energy transfers into the nearshore crust is fundamental for constraining microseism generation mechanisms and assessing coastal hazard impacts. However, direct quantification has long been hindered by the lack of high\u2013temporal-resolution, in-situ observations. A research team led by Associate Professor Justin Yen-Ting Ko at the Institute of Oceanography, National Taiwan University, deployed [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.oc.ntu.edu.tw\/en\/news-en\/37185\/\" \/>\n<meta property=\"og:site_name\" content=\"Institute of Oceanography, NTU\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/IONTUTW\" \/>\n<meta property=\"article:published_time\" content=\"2026-02-23T01:27:53+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-02-23T01:29:37+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.oc.ntu.edu.tw\/wp-content\/uploads\/2026\/02\/KO260223.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1023\" \/>\n\t<meta property=\"og:image:height\" content=\"943\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"\u660e\u8b19\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u660e\u8b19\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.oc.ntu.edu.tw\/en\/news-en\/37185\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.oc.ntu.edu.tw\/en\/news-en\/37185\/\"},\"author\":{\"name\":\"\u660e\u8b19\",\"@id\":\"https:\/\/www.oc.ntu.edu.tw\/en\/#\/schema\/person\/9ce33dd1f6feaaa0042595cd3f475409\"},\"headline\":\"Quantifying Ocean-to-Solid Earth Energy Conversion Using Nearshore Fiber-Optic DAS\",\"datePublished\":\"2026-02-23T01:27:53+00:00\",\"dateModified\":\"2026-02-23T01:29:37+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.oc.ntu.edu.tw\/en\/news-en\/37185\/\"},\"wordCount\":360,\"publisher\":{\"@id\":\"https:\/\/www.oc.ntu.edu.tw\/en\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.oc.ntu.edu.tw\/en\/news-en\/37185\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.oc.ntu.edu.tw\/wp-content\/uploads\/2026\/02\/KO260223.jpg\",\"articleSection\":[\"RECENT NEWS\",\"Research Highlights\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.oc.ntu.edu.tw\/en\/news-en\/37185\/\",\"url\":\"https:\/\/www.oc.ntu.edu.tw\/en\/news-en\/37185\/\",\"name\":\"Quantifying Ocean-to-Solid Earth Energy Conversion Using Nearshore Fiber-Optic DAS - 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