Submarine cables could be repurposed as earthquake detectors

EARTH is observed as never before. Satellites track typhoons, monitor volcanic-ash plumes and catalogue the changing ways in which human beings use the land. The sort of high-quality imagery that, a couple of decades ago, was the preserve of spies in rich and powerful countries is now freely available to users of Google Maps. But despite its name, most of Earth is covered in water, and it is much harder to monitor what goes on beneath the waves. In a paper just published in Science, Giuseppe Mar...