Superstorm Sandy Shook US, Literally. It's Ocean Waves Registered Seismically.

[KittyWampus]

Just found this interesting.

Superstorm Sandy Shook the U.S., Literally

Apr. 18, 2013 — When superstorm Sandy turned and took aim at New York City and Long Island last October, ocean waves hitting each other and the shore rattled the seafloor and much of the United States -- shaking detected by seismometers across the country, University of Utah researchers found.

"We detected seismic waves created by the oceans waves both hitting the East Coast and smashing into each other," with the most intense seismic activity recorded when Sandy turned toward Long Island, New York and New Jersey, says Keith Koper, director of the University of Utah Seismograph Stations.

"We were able to track the hurricane by looking at the 'microseisms' [relatively small seismic waves] generated by Sandy," says Oner Sufri, a University of Utah geology and geophysics doctoral student and first author of the study with Koper. "As the storm turned west-northwest, the seismometers lit up."
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The shaking was caused partly by waves hitting the East Coast, but much more by waves colliding with other waves in the ocean, setting up "standing waves" that reach the seafloor and transmit energy to it, Sufri and Koper say.


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Earthscope Picks up Seismic Waves from Ocean Wave Collisions

"The energy generated by Sandy is going to be used to image the crust and upper mantle under North America," says Koper, noting that Earthscope uses years of seismic data to construct images. "We are using seismic waves created by ocean waves to make images of the continent."

Normal ocean waves "decay with depth very quickly," says Koper. But when Sandy turned, there was a sudden increase in waves hitting waves to create "standing waves" like those created when you throw two pebbles in a pond and the ripples intersect. "Pressure generated by standing waves remains significant at the seafloor," he says.

"When Sandy made that turn to the northwest, although wind speeds didn't get dramatically bigger, the seismic energy that was created got tremendously bigger because the ocean's standing waves were larger from the wave-wave interaction," he adds.
Not only did the seismic waves become more energetic, "but the periods got longer so, in a sense, the sound of those seismic waves got deeper -- less treble, more bass -- as the storm turned," Koper says.
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http://www.sciencedaily.com/releases/2013/04/130418213919.htm

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1. "most intense seismic activity recorded when Sandy turned toward Long Island"

How can anyone explain this?

Maybe the crazies are right?

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