This University of Utah video shows how ocean wave action from superstorm Sandy in October 2012 shook the United States, and how the shaking was detected by the Earthscope array of seismometers funded by the National Science Foundation. Blue color means low seismic activity; yellow, orange and red mean high seismic activity. Note how the seismometers twice flash briefly orange-red due to two earthquakes before Sandy appears near the bottom of the screen. As Sandy proceeds north, the seismometers show increasing activity and "point" to Sandy, indicating it is the source of the seismic events, which are "microseisms" and not real earthquakes. The seismometers then show maximum activity when Sandy turns west-northwest toward Long Island, New York City and New Jersey.
Credit: Keith Koper, University of Utah Seismograph Stations.
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