top sheet 20 unthreaded ends on bolts 38 extend into sockets 34 as bolts 36 are threaded downwardly through bosses 38 the ends press sockets 34 downwardly compressing springs 32 thus producing an upward spring force on box 19 reducing friction between bottom frame 24 and surface 14 in the event of an earthquake base 10 will oscillate with the earth relative to box 19 and the building being supported in order to allow the building to retain relatively stable and to damp the oscillations box 19 will slide back and forth while plate 30 remains relatively stable as best seen in fig3 a plurality of small outwardly extending compression springs 40 in tubular housings 42 secured to plate 30 will encounter and cushion contact between plate 30 and bottom frame 24 in the event of severe oscillations with severe oscillations or where longitudinal forces are produced in one direction due to earth slippage springs 40 will tend to be impacted by frame 24 in one direction moving plate 30 across surface 14 toward a wall 16 as the frame approaches a wall 16 it will contact a spring band 18 which will absorb energy and help prevent severe impact with a wall frames 24 preferably have a box section as shown to spread the load against spring bands 18.