In theory the mechanism is really quite simple:
1. A sensor detects the rumblings of an earthquake.
2. Within .5 to 1 second an air tank pushes air in-between an artificial foundation and the actual structure of the home, lifting it as high as 3cm off the ground.
3. While the earth below violently shakes, the levitating home quietly and patiently waits, returning back to the ground once the tectonic plates have settled.
There are pictures and videos at the link, and the company claims it is implementing the idea at 88 sites. The final video is especially fine.