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"To help mitigate future seismic disasters, Japan has built a sprawling undersea earthquake-detection system capable of providing up to 20 additional minutes of warning time before tsunamis hit coastal areas. During Fukushima, residents had just 10 minutes of warning."
"... With the final N-net link set up this June, the complete system increases warning times by 20 seconds for earthquakes and a full 20 minutes for tsunamis—enough time to divert incoming flights and close sea gates in busy ports.” ..."
"... Within months of the 2011 [Fukushima] earthquake, the Japanese government began to build S-net (Seafloor Observation Network for Earthquakes and Tsunamis). S-net wired the nation’s earthquake-detection network to the Japan Trench, the seismologically active offshore region where the 2011 earthquake began. Roughly 3,540 miles of cable now zigzag across 116,000 square miles of ocean to connect 150 observatories on the ocean floor. Each contains 14 distinct sensing channels, including seismometers and accelerometers, as well as pressure gauges to measure waves passing overhead.
This network—the first part of the larger network that was completed in June 2025—was finished in 2017. When a magnitude 6.0 quake struck the following year, alerts reached the cities before the first jolt hit—a full 20 seconds before the nearest land seismometer rang its alarm—allowing precious time to slow bullet trains and broadcast warnings. ..."
Japan Wires the Ocean with an Earthquake-Sensing ‘Nervous System’ (original news) "Japan’s new earthquake-detection network lengthens warning times, and researchers in Wales have harnessed nuclear blast detectors to gauge tsunami risks. But the U.S. lags in monitoring the massive Cascadia megathrust fault"
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