Stochastic nature of earthquake has raised a challenge for engineers to choose which record for their analyses. Clustering is offered as a solution for such a data mining problem to automatically distinguish between ground motion records based on similarities in the corresponding seismic attributes. The present work formulates an optimization problem to seek for the best clustering measures. In...

Attenuation relation (Ground-motion prediction equation) The term “attenuation relation” is a former short-hand notation in earthquake engineering for “empirical ground-motion attenuation relationship”, now referred to as “ground-motion prediction equation” (GMPE). Attenuation relations represent empirical scaling equations that relate observed ground-motion intensity measures to parameters of ...

Siberian tundra is characterised by permafrost overlaid with an active layer. The spatial and temporal variation in the thaw depth in the active layer may play an important role in biological and hydrological processes. In this study, we carried out field investigations of flat tundra and a hillslope in a watershed near Tiksi, Siberia, at various scales, from 1997 to 2000. The ground started to...

Ground motion and vibration can be a limiting factor in the performance of future colliders, in particular linear colliders and large hadron colliders. Investigations of ground motion have been carried out around the world for several decades. In this review, after brief discussion of ground motion requirements for NLC, TESLA and VLHC, the results of recent investigations of ground motion are p...

Following previous measurements [1], more detailed preliminary ground motion measurements have been performed at the LNF site for the Super B project site characterization [2]. First, results of vertical ground motion measurements done during 18 hours are shown in order to get an idea of the evolution of the ground motion amplitude with time. Secondly, measurements of ground motion (in the 3 di...

Motion differences contribute to the segregation of a figure from its background. While some important work has addressed the role of motion in figure processing, many questions remain as to the cortical structures involved and their particular activation properties. In the research described here, I measured steady-state visual evoked potential responses to moving dot displays in which figure ...

contrary to the long period ground motions that can be predicted and estimated, high frequency ground motions have random character and behave stochastically. stochastic modeling methods are usually used for the modeling of high frequency ground motions where there are not strong ground motion records. stochastic methods are of two kinds: in the first one, the seismic source is considered as a ...