Portuguese geologist says top layer may be peeling from bottom—potentially creating a new subduction zone.
There’s something weird going on in the Atlantic Ocean. Off the coast of Portugal, a tectonic plate may be peeling apart, with the top layer separating from the bottom, a scientist has proposed.
Duarte has been investigating the seismic history of Lisbon for decades. Previously, scientists had proposed that the bottom of the tectonic plate that Portugal sits on is peeling away from the top. Almost a decade ago, researchers were studying the region using seismic waves when they found a dense structure beneath the crust. Further research revealed that tiny earthquakes were occurring at this mass over an area stretching 150 miles.
The tectonic plates are constantly moving. At subduction zones, one plate sinks beneath another. In other areas, the plates are moving apart. Over the history of planet Earth, this movement has led to different configurations of the planet’s land masses, including the supercontinents of Pangea and Gondwana. Subduction zones are the main feature driving the movement of Earth’s tectonic plates—but how they form is unclear.
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