High Quality Content by WIKIPEDIA articles! Various types of vibration sources are always producing so called Ambient Vibrations on the Earth ground (also called ambient noise). These vibrations are mostly surface waves (Rayleigh waves, Love waves) propagating on the surface. Low frequency waves (below 1 Hz) are generally called microseisms and high frequency waves (above 1 Hz) are called microtremors. These ambient vibrations are used in practice to derive the elastic properties of the ground and the low-strain dynamic properties of civil-engineering structures (bridges, buildings, dams...). This information is useful for different purposes : fundamental seismology, engineering seismology, Earthquake engineering, Seismic microzonation, Structural health monitoring, but also Hydrology, Geotechnical Engineering, etc. Данное издание представляет собой компиляцию сведений, находящихся в свободном доступе в среде Интернет в целом, и в информационном сетевом ресурсе "Википедия" в...

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