Cheap earthquake warning systems [News]

While predicting earthquakes remains a dream, scientists have developed early-warning systems that give people precious seconds to run out of buildings or take cover. Such systems are in place in Japan and Mexico. The U.S. Geological Survey (USGS) is testing a system that gave a 5- to 10-second warning when a temblor hit California???s Napa Valley in 2014. That kind of warning might have saved hundreds of lives when a 7.8-magnitude earthquake devastated Nepal on 25 April.