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We study the behavior of cylindrical objects as they sink into a drygranularbed fluidized due to lateral oscillations. Somewhat unexpectedly, we have foundthat, within a large range of lateral shaking powers,cylinders with flatbottoms sink vertically, while those with a''foundation'' consisting inashallow ring attached to their bottom, tilt besides sinking. Thelatterscenario seems to dominate independently from the nature ofthe foundation whenstrong enough lateral vibrations are applied. Weare able to explain theobserved behavior by quasi-2D numericalsimulations, which also demonstrate theinfluence of the intruder's aspect ratio. The vertical sink dynamics isexplained with the help of a Newtonian equation of motion for the intruder. Ourfindings may shed light on the behavior of buildings and other man-madeconstructions during earthquakes.

Sink versus tilt penetration into shaken dry granular matter: The role of the foundation