Devastating earthquakes occur every 100 to 200 years in the Nankai Trough off the coast of southeast Japan. To prepare for the next big one, scientists use the Dense Oceanfloor Network System for Earthquakes and Tsunamis (DONET), a network of 20 subsea observatories that captures data on crustal movements in real time. The information also helps scientists develop simulations to improve earthquake forecasting and early-warning systems. By 2015, 31 new stations will provide even greater coverage.
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