Shake Table Test 2020

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=P3rDwPA3Oo0

http://www.iris.edu/hq/waves • • As seismic waves radiate out from the epicenter of an earthquake and encounter Earth's surface, they cause the ground to move. Unless the earthquake is nearby, the scale of these motions are generally too small, perhaps only .001mm (a fraction of the diameter of a human hair), and occurs over a time scale, 100s of seconds, that is too long for humans to feel or detect. However, sensitive instruments such as seismographs are able to discern such changes and record them as seismograms. This visualization uses a color scale to indicate the change in amplitude of the ground through time as recorded at nearly 400 seismic stations that make up the USArray. Here warm colors represent a positive displacement while cool colors represent a negative displacement (Red = +.001mm and Blue = -.001mm). Because the seismometers are distributed in a grid with unprecedented density, a spacing of approximately 70km, the collective display of the ground motion across the array is particularly informative both for teaching and scientific research. • • This dense deployment of seismometers is part of a large-scale geoscience experiment, EarthScope, which is funded by the National Science Foundation. The goal of EarthScope is to explore the structure and evolution of the North American continent. This basic research contributes to the development of natural resources, the mitigation of geologic hazards, an understanding of the forces that shape our landscape and our understanding of the planets structure and inter-workings.

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