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American Focus > Blog > Tech and Science > Japan’s New Undersea Earthquake Detection System Will Improve Tsunami Prediction
Tech and Science

Japan’s New Undersea Earthquake Detection System Will Improve Tsunami Prediction

Last updated: July 10, 2025 12:25 am
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Japan’s New Undersea Earthquake Detection System Will Improve Tsunami Prediction
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Japan has taken a significant step in earthquake detection by implementing a new system that can provide early warnings and potentially save lives. The country has established a network of fiber-optic cables connected to sensors placed on fault lines where earthquakes typically originate. This system, known as S-net (Seafloor Observation Network for Earthquakes and Tsunamis), spans thousands of miles across the ocean floor and aims to prevent the kind of devastation witnessed in 2011.

The 2011 earthquake in Japan, a magnitude 9.0 megathrust event, triggered a massive tsunami that caused widespread destruction and loss of life. The delayed alerts at that time left communities with minimal time to evacuate and inaccurate information about the impending disaster. In response to this tragedy, Japan began expanding its earthquake detection system to cover the ocean floor, providing real-time monitoring of subduction zones and increasing warning times for future events.

Harold Tobin, a seismologist, emphasizes the importance of wiring up the offshore fault zone to constantly monitor and detect subtle signals that indicate fault activity. By listening to these signals, scientists can gain valuable insights into how faults behave, including stress buildup and release leading up to an earthquake.

In addition to Japan’s efforts, researchers at Cardiff University in Wales have developed a tsunami detection program called GREAT (Global Real-Time Early Assessment of Tsunamis). This program utilizes hydroacoustic ocean stations originally created to detect nuclear bomb blasts and can quickly assess earthquake magnitude, fault slip type, and tsunami potential.

While Japan and Wales have made significant progress in earthquake and tsunami detection, the Cascadia megathrust fault along the Pacific Northwest coast remains a concern. This fault, which has the potential for rare but massive quakes, is currently under-monitored compared to Japan’s systems. Funding has recently been secured to enhance monitoring along the Cascadia fault, but there is still much work to be done to provide early warnings and preparation time for the millions of people living in the region.

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As Japan continues to build its ocean-floor ‘nervous system’ and other countries work on enhancing their detection systems, the goal remains the same: to improve early warning systems, increase preparedness, and ultimately save lives in the event of a major earthquake or tsunami.

TAGGED:detectionearthquakeimproveJapanspredictionSystemTsunamiundersea
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