A ground motion model based on geo-physical arguments is presented. The purpose of this model is to predict possible beam separation in the interaction regions of the LHC due to ground motion developing in time spans in the order of seconds to hours. Although this model can also be used to predict statistical movement of accelerator objects on a larger time scale (yearly alignment) its usefulne...

We attempt in this note to make plausibility arguments regarding the magnitude of tolerable ground motions for the SSC. A cornpleat, general and quantitative treatment of every conceivable effect awaits far more effort than could have been marshalled for this preliminary study. This note is in three parts: Section 1. A description of the types of motions likely to be encountered on any site and...

The behavioral algorithms and neural subsystems for visual figure-ground discrimination are not sufficiently described in any model system. The fly visual system shares structural and functional similarity with that of vertebrates and, like vertebrates, flies robustly track visual figures in the face of ground motion. This computation is crucial for animals that pursue salient objects under the...

Buildings should be designed to resist moderate ground motion with­ out structural damage and resist intense ground motion with controlled damage. However, most codes do not consider both these requirements explicitly and specify a single design earthquake that generally corresponds to intense ground motion. Investigated in this study is the response of one-story, asymmetric-plan systems design...