A tectonic plate may have peeled apart—and that could shrink the Atlantic Ocean


Something strange is happening off the coast of Portugal, and scientists have now proposed a groundbreaking explanation.

 

For years, João Duarte has puzzled over a seemingly boring underwater expanse off the coast of Portugal. In 1969, this site spawned a massive earthquake that rattled the shore and sparked a tsunami. But you would never know why just from looking at the broad, featureless surface of the seabed. Duarte, a marine geologist from the Instituto Dom Luiz at the University of Lisbon, wanted to find out what was going on.

Now, 50 years after the event, he may finally have an answer: The bottom of the tectonic plate off Portugal’s coast seems to be peeling away from its top. This action may be providing the necessary spark for one plate to start grinding beneath another in what’s known as a subduction zone, according to computer simulations Duarte presented in April at the European Geosciences Union meeting.

If confirmed, the new work would be the first time an oceanic plate has been caught in the act of peeling—and it may mark one of the earliest stages of the Atlantic Ocean shrinking, sending Europe inching toward Canada as predictedby some models of tectonic activity.[…]

Source: A tectonic plate may have peeled apart—and that could shrink the Atlantic Ocean

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About agogo22

Director of Manchester School of Samba at http://www.sambaman.org.uk
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1 Response to A tectonic plate may have peeled apart—and that could shrink the Atlantic Ocean

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