"The conceptual cloak will be made up of several large, concentric plastic rings affixed to the Earth’s surface. In order for the destructive surface waves to pass smoothly into the plastic, the stiffness and elasticity of the rings must be very closely controlled. The waves that travel through the cloak are compressed into minuscule fluctuations in pressure and density and are able to travel along the fastest path available. The path can be molded into an arc that directs surface waves away from objects inside the cloak by tweaking the characteristics of the plastic. As soon as the waves exit the cloak, they return to their original, larger size."

....More at the site: http://www.inhabitat.com/2009/06/30/invisibility-cloaks-may-shield-buildings-from-earthquakes/