How Huge Subterranean Grids Could Protect Cities From Earthquakes

French engineers have been experimenting with a technique that could redirect seismic energy away from structures such as cities, dams, and nuclear power plants, sparing them from damage. It involves digging large, cylindrical boreholes into the ground, forming a defensive geometry of lace-like arrays that,… » 4/08/14 6:00pm 4/08/14 6:00pm