Japan launches worlds first underwater earthquake early warning system with 6,000 km of fiber optics Japan unveils pioneering fiber optic network for seismic safety and disaster preparedness ...

The “megathrust” earthquake’s undersea magnitude was 9.0, recorded as one of the worst in Japan’s history. It began on the Pacific seabed 45 miles away from the eastern coast of Japan, as reported by ...

Japan has completed the world’s most advanced undersea earthquake and tsunami detection system—3,500+ miles of fiber-optic ...